Raelynn could probably sing a lot better with legit coaching. Coffeehouse girl on Xtina probably could as well. Both are very marketable.
Wichita guy is a long shot to be successful, but I guess he could be the next Groban or something. Big girl on team Blake has a lot less of a chance to be successful than Raelynn, even based on purely voice. She just sings songs 90-95% as good as the original. No idea why anybody would listen to that. Nothing interesting about her.