So just to check I read everything right.
That about right? If so, I love the general theme you've got going on.
- You have your base pet.
- You can upgrade to a bigger 'demi' pet at 3 stacks.
- DWT is now a cooldown that changes your filler spell to a primal themed one.
- 3 demi summons unlocks Bahamut.
I'd personally prefer to keep the default egi (with carbuncle glam option) and have them upgrade into the bigger demi versions, I'm also iffy on giving commands through your own abilities, the pet switching to AoE when you do would be ok but in general I prefer to give proper commands.
Other than that, seems pretty solid to me. Sort of similar to my own ideas I've posted in the past.