Hero = Excellent at everything, only problem would be toning down his style but he's already improved so much at working a strong style match that I'm convinced he could work whatever style they want him to. Also, there's the matter of adjusting his great microphone work to PG audiences, the same issue every indy guy has.
Castagnoli = Workrate, workrate, workrate, but he's worked as the big guy for so long that I don't know how he'd mesh in the WWE where most of the guys are bigger than him.