Ok I can't find a better place to put this, and it's been driving me crazy. I have a few test cases for you guys to review and some arguments supporting each one.
First off, some ground work, Brawler, Warpriest, and Swashbuckler, all have rules stating that their respective classes can be used to determine what bonus fighter combat feats they qualify for.
Likewise extra uses of rage affect how many rage rounds can be used, collectively, and not interdependently if you have rage, blood-rage, or raging performance, i.e. all separate abilities, sharing the same pool of rounds. Also included in here is your grit, luck, panche all part of the same pool, with different names, in fact grit users can pick up, or I believe they can any panche feats, that do not have another class requirements.
That was all very long winded and not to the point directly and I apologize, and where are those examples I inferred to earlier? So lets start out with the obvious;
sorc5/dd1: would be a dragonic bloodline sorcerer with the effective bloodline of 6 simple enough.
bard5/dd1: Also a simple enough bard with 1 dragonic bloodline feature and forced dragonic bloodline if he ever gets one.
Arcanist 5/DD1 with bloodline development, I know arcanist is a "Prepared caster", but I feel they are a spontaneous caster as defined @CRB. Also the Spell Lattice item treats them like Spontaneous casters not Prepared; Bloodline development states that the arcanist chooses a bloodline and acts as a level one sorcerer until which time they use a point from their reservoir and then treat their Arcanist level as their effective level.
Unless this said arcanist has or gains a bloodline from another class, doesn't say sorcerer, and combine the two sets of levels to determine the arcanist's bloodline powers. So in this case pretty easy 6 levels of draconic heritage, boom!
Now lets use that previous example as a jumping off point; if say we do this....
ARC 3/Blood Rager 1; oh so now we get a bloodline, so now the interesting parts, while the BR grants a bloodline it's powers only manifest when raging where as the sorcerer's are rounds per day. Of course this would not allow the character to cast most of his spells while raging, but would it allow for 4th level blood rager bloodline abilities, or first? Wording suggests that you would get 4th level sorcerer bloodline abilities though.... Or take the lesser of 2 evils and only allow the bloodline abilities to manifest when raging?
The key thing here is that we have a very close comparison to both examples as with Brawler, warpriest, and Swashbuckler; Arcanists says you gain sorcerer bloodline powers, but if you gain a bloodline from a class you can add your arcanist lvls to it just like dragon disciple says you can with sorcerer, where as a skald/bard would have to choose between the two, rounds of raging performance, or regular bardic performance.
Where as, a gunslinger/swashbuckler would have a single pool of points to draw on for both their classes abilities, almost the same thing; I'd like to argue, that a Bloodrager/Dragon Disciple, would stack but only in blood rage, i.e. you can use your weaker, sorcerer/Disciple derived powers outside of blood rage, and only Blood Rage fueled powers while transformed by your heritage ALA Bloodrager:
So a BR5/DD3 might be able to blast you with his 3d6 breath weapon and all the claws and bites at 1d6, it's only when his/her wrath his provoked can they unleash the 8d6 breath weapon, d8 claws and bite; but these rounds draw on his sorcerer rounds/uses; if he's used his rounds of claws from sorcerer he can't bite, and the breath weapon is only 5d6, that's one idea, it's a amalgamation of the 2 options; IDK if it's better or worse but that's my take on it.
