I'm dreading the day they reveal that a resident WWE star was behind it all along. They usually go that route, ECW had Shane and Austin as their leaders, WCW had Stephanie, god even NWO had Vince behind them. They don't understand the concept of a "rebel" faction.
If they recruit anybody, I agree with those who said it should be NXT contenders, or just new and unestablished wrestlers. It's a chance for them to get exposure and prove themselves and it's also a great opportunity for talented wrestlers who aren't so good with the mic, as Wade can do their talking.
I'd like to see Lucky Cannon there, but only so they could turn on him. The guy is such a natural babyface (like AJ Styles) and having Nexus turn on him and bully him would be a great chance to get both parties over.
Otherwise, Daniel Bryan and Kaval should definitely be in the group. Kaval should speak up about the humiliation he experienced on NXT and use it as his motive for joining Nexus and turning on WWE.