Hi,
i played Onslaught with five my characters, i cannot help, but joining Republic/Empire is for example for trooper great lose.
Alliance pack with full recruitment of allies from alerts, Mandalorians, maybe gratelful zakulans in future - post of commander. All that trade for colonel? Be once again lackey of republic generals???
But i can imagine, as for Inquisitor, seat in the council, once again powerbase within sith empire - sounds good.
Or maybe smuggle - rank of commodore? More better then captain. And smuggling ring can flourish again.
Yes, i know, fleet and gravestone is gone, but The Alliance has quite powerfull fleet of normal (even isotope-5) ships, Odessen planetary shield and can against both superpowers by guerilla warfare...
What do you think?