I couldn't figure out how to edit a post so I'm making a new one.
I noticed two other things worth mentioning. Tiny creatures can't flank normally, so the only way this build can flank is with the mouser ability. Most of the time this shouldn't change much, but if your ally had a reach weapon, for example, he might have a hard time being adjacent to both you and the enemy you're trying to flank. Unless of course he has short haft.
The other thing is you have levels of paladin and slayer. If a paladin sneak attacks, he breaks his code of honor and loses all his paladin abilities until he atones. Unless the iroran paladin can sneak attack (I can't find it on the srd) or can also be a gray paladin, or there's a slayer archetype that doesn't sneak attack.