I've seen at least one turkey boss, a Muskateer named Captain Fowl, as Fin Dorsal's buddy back in Gullet Market House. Maybe we'll get a way to unlock him as a Crowns buyable crewman?
Then again, keeping him and Ratbeard from trying to kill each other might be a challenge...
I'd like to think that the player's pirate, a (mostly) innocent child, is the glue that keeps together his or her crew of bloodthirsty pirates with nothing in common, by charisma alone.
As a Privateer, you basically force Emmet the otter to work with Ratbeard, who was also his enemy back in the Kraken Skulls Tavern. You can hire Fin Dorsal, who betrayed Avery, and Sgt. Shepherd, who 'had a score to settle' with the Cutthroat... Not to mention various other bad guys who possessed no greater desire than to kill off you and your crew; Bosun Budd, the corrupted Valvidas, Eep Opp Ork Ah-Ah, the list goes on. It's actually sort of entertaining to imagine how on earth you are getting to get all these polar opposite characters to work together for the greater good.