I think all of them will succeed somehow, though I do think Reigns may be just your usual powerhouse who doesn't talk much and may get lost in translation.
I'm real interested in what Ambrose and Rollins has to offer. Ambrose is really entertaining on mic and I've been sent his past work when he use to be Jon Moxley, and damn dude, shit was pretty intense and I got attached to his character quick. Then, there's Rollins who sells moves like a freakin' boss. I still can't forget the TLC match. I was amazed. Plus, any Potter fan is freakin' awesome in my book.