I dont think a non- singer can win. Even Fators main thing was singing with uppets.
Its between the Ridley Woman and Grimm IMO.
Once the show starts feeding the story of Grimms Family still with nothing after Katrina and he sings some poular song he get the votes I think.
But Fighting gravity is cool, probably my favorite act to watch out of all them. I think they probably got alot of ideas from watching this.
http://www.youtube.com/watch?v=-dcmDscwEcI