What's all this about Jado leaving the Sith? XD If you want, I'd be glad to have Sato play a part in his defect to the Jedi, since I'm really looking for story-related things to do with her at the moment.
I think they should meet before the timeskip. That way, they would remember each other. I think they would talk about their reason of fighting for their sides, Jado's betrayal, ... Eventually, they would fight, with Avreet being a winner since he has been on some missions and is a trained assassin. He wouldn't hurt Jado though, just gave him something to deliver to another Jedi.
Probably not. I haven't RPed enough threads with him yet, so I don't want to skip that much time with him, but does it really matter since he is a Mon Cal? It's not like anyone can tell his age.
IDK. He is quite patriotic and proud of being a Sith. He views the Sith as the Jedi view themselves, a protector and lawbringer. He has no reason to deflect, he has never seen the Empire do something evil. Other Sith might see him as weak though, so he would be forced to flee
Why did ge leave the Empire then? He barely had any chance of seeing if it was evil or not. Take Avreet for example, he still thinks the Empire is good.