Critique my rogue / druid NPC!

[Oserath]

So this guy was in our campaign earlier as a Druid 4/ Rogue 1. He escaped the PCs and is now returning. His main tactic is to flank with his AC in order to get as many sneak attacks as possible. At this point I'm thinking he will favor Dire Tiger form. I'll be happy to hear any input. His base stats at level 5 were 8, 16, 14, 8, 16, 11. So unfortunately, he can't get a very high strength value, and I'm stuck with Brew Potion, Combat Casting, and Dodge. He has a lot of temporary buffs active, because he will be preparing for his fight with the PCs.

Spoiler:

Gogmurt CR 11
XP 12800
Male Goblin Druid 9/Rogue 3
NE Small humanoid (goblinoid)
Init +5; Senses darkvision 60 ft.; Perception +7
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Defense
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AC 31, touch 21, flat-footed 25 (+4 armor, +2 shield, +5 Dex, +1 size, +4 natural, +4 deflection, +1 dodge)
hp 102 (12d8+45)
Fort +14, Ref +15 (+1 bonus vs. traps), Will +16; +4 vs. spell-like and supernatural abilities of Fey and against effects that target plants
Defensive Abilities evasion, trap sense; Immune poison
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Offense
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Speed 40 ft.
Melee heavy shield bash +8/+3 (1d3+3) and
masterwork cold iron dagger +13/+8 (1d3+3/19-20)
Special Attacks sneak attack +2d6
Druid Spells Prepared (CL 9th; concentration +14):
5th (2/day)—animal growth (DC 20), cure critical wounds
4th (3/day)—air walk, strong jaw (x2) (DC 19)
3rd (4/day)—greater magic fang (x4)
2nd (5/day)—bull's strength (x2), barkskin (x2), cat's grace
1st (6/day)—liberating command, touch of the sea (DC 16), longstrider (x2), produce flame, strong wings
0 (at will)—purify food and drink (DC 15), detect magic, read magic, spark (DC 15)
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Statistics
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Str 12, Dex 20, Con 16, Int 8, Wis 20, Cha 11
Base Atk +8; CMB +10; CMD 28
Feats Brew Potion, Combat Casting, Dodge, Natural Spell, Quick Wild Shape, Shaping Focus
Skills Acrobatics +6 (+10 jump), Appraise +1, Bluff +2, Climb +6, Diplomacy +2, Disguise +2, Escape Artist +6, Fly +13, Handle Animal +10, Heal +7, Intimidate +2, Knowledge (geography) +9, Knowledge (local) +9, Knowledge (nature) +16, Linguistics +6, Perception +7 (+8 to locate traps), Ride +14, Sense Motive +7, Stealth +29, Survival +16, Swim +6; Racial Modifiers +4 Ride, +4 Stealth
Languages Common, Druidic, Giant, Goblin
SQ nature bond abilities (animal companion, roc), resist nature's lure, rogue talents (fast stealth), spontaneous casting, trackless step, trapfinding +1, wild empathy, wild shape, wild shape (animal), wild shape (elemental), wild shape (plant), woodland stride
Combat Gear Potion of cat's grace, Potion of good hope, Potion of mage armor, Potion of Shield of Faith (CL 12); Other Gear Leaf armor, Masterwork Heavy wooden shield, Blowgun darts (5), Masterwork Cold Iron Dagger, Belt of mighty constitution +2, Cloak of resistance +2, Flaming Amulet of mighty fists, Headband of inspired wisdom +2, Spell component pouch
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TRACKED RESOURCES
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Blowgun darts - 0/5
Masterwork Cold Iron Dagger - 0/1
Potion of cat's grace - 0/1
Potion of good hope - 0/1
Potion of mage armor - 0/1
Potion of Shield of Faith (CL 12) - 0/1
Wild Shape (5/day) (Su) - 0/5
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Special Abilities
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Animal Companion Link (Ex) You have a link with your Animal Companion.
Combat Casting +4 to Concentration checks to cast while on the defensive.
Darkvision (60 feet) You can see in the dark (black and white vision only).
Evasion (Ex) If you succeed at a Reflex save for half damage, you take none instead.
Fast Stealth (Ex) You may move at full speed while using the Stealth skill without penalty.
Immunity to Poison You are immune to poison.
Natural Spell You can cast spells while in Wild Shape.
Potion of Shield of Faith (CL 12) Add this item to create a potion of a chosen spell.
Quick Wild Shape Wild shape quickly into a less powerful form
Resist Nature's Lure (Ex) +4 save vs. effects from Fey and effects using plants.
Share Spells with Companion (Ex) Can cast spells with a target of "you" on animal companion, as touch spells.
Sneak Attack +2d6 +2d6 damage if you flank your target or your target is flat-footed.
Spontaneous Casting The Druid can convert stored spells into Summon Nature's Ally spells.
Trackless Step (Ex) You do not leave a trail as you move through natural surroundings.
Trap Sense +1 (Ex) +1 bonus on reflex saves and AC against traps.
Trapfinding +1 Gain a bonus to find or disable traps, including magical ones.
Wild Empathy +9 (Ex) Improve the attitude of an animal, as if using Diplomacy.
Wild Shape (5/day) (Su) Shapeshift into a different creature one or more times per day.
Wild Shape (Beast Shape III: Diminutive - Huge animal) You may use your Wild Shape ability to become an animal.
Wild Shape (Elemental Body IV: Small - Huge elemental) You may use your Wild Shape ability to become an elemental.
Wild Shape (Plant Shape III: Small - Huge plant creature) You may use your Wild Shape ability to become a plant creature.
Woodland Stride (Ex) Move through undergrowth at normal speed.

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Animal Companion
Male Roc
N Huge animal
Init +6; Senses low-light vision; Perception +1
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Defense
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AC 34, touch 14, flat-footed 28 (+6 Dex, -2 size, +20 natural)
hp 76 (+40)
Fort +10, Ref +12, Will +3 (+4 morale bonus vs. Enchantment spells and effects)
Defensive Abilities evasion
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Offense
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Speed 30 ft., fly 80 ft. (average)
Melee bite +18 (6d6+13) and
2 talons +17 (3d6+13 plus grab)
Space 15 ft.; Reach 15 ft.
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Statistics
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Str 35, Dex 22, Con 18, Int 3, Wis 13, Cha 11
Base Atk +6; CMB +20 (+24 grapple); CMD 36
Feats Improved Natural Attack (bite), Multiattack, Power Attack, Toughness, Weapon Focus (bite)
Skills Fly +13, Stealth -2
SQ devotion, multiattack / extra attack
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TRACKED RESOURCES
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-none-
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Special Abilities
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Devotion +4 (Ex) +4 Morale bonus on Will Saves vs. Enchantments.
Evasion (Ex) No damage on successful reflex save.
Flight (80 feet, Average) You can fly!
Grab: Talon (Huge) (Ex) You can start a grapple as a free action if you hit with the designated weapon.
Low-Light Vision See twice as far as a human in low light, distinguishing color and detail.
Multiattack / Extra Attack Multiattack or second attack with primary weapon at a -5 penalty.
Power Attack -2/+4 You can subtract from your attack roll to add to your damage.

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[Arliss Drakken]

The believability factor isn't that high for me, and there are a number of reasons:

a) It seems a little hard for me to believe that this goblin has a custom tailored 12th level cleric spell potion and a rare, 1050gp potion for an obscure 3rd level spell only bards know just to geek out his AC. What bard has Brew Potion to begin with, being feat strapped as they are? I would think NE feral druid/rogue goblins would focus on offensive buffs.

b) Why is the goblin getting the appropriate amount of prep time to buff? Is his huge-sized Roc hiding as well with a -2 Stealth? Won't the party hear him casting spells?

c) Why does he have 28,000+gp in gear, which is generally the amount for a CR16 or 17 encounter? Even by the NPC scale, they typically wouldn't have this much gear until Level 13+, and to fit in a 16,000gp amulet would typically be in the level 15-16 range.

Is this the final boss fight in an otherwise treasure poor segment?

d) The build is a little problematic in that you're probably only going to get sneak attack one time unless you plan on putting the Roc on the ground and trying to flank.

Remember the rules on issuing orders to animal companions if you are going to have Roc do something odd, like not fly.

[Oserath]

The potions are available to give him some increased AC in order to provide a reasonable challenge. That said, replacing the good hope (which doesn't add to AC) with heroism would change very little, and dropping the Shield of Faith to +3 would be more reasonable.
He has appropriate time to buff, the reasons don't matter. He is aiding in an attack on the town the PCs are defending. They expect an attack from outside the walls, however, he will be arriving elsewhere through burrowing.
As a heroic level 12 NPC, he should have 21K of gear. He actually has 18K, since the amulet is only 4K, not 16K.
Part of the reasoning behind raising the Roc's Int is to allow it to receive more complex commands.

That being said, should I switch Fast Stealth for Finesse Rogue, and use the leopard for wild shape, since that has pounce, while merely being a medium creature?

Thanks for the input.