Well... if you didn't see it here it is!
http://www.youtube.com/watch?v=3BkeuntHRpMTua has good movement and is in shape. Most any top Heavyweight when he connects it's going to do damage. I think Tua has a good chance certainly as better than Arreola because Arreola head doesn't move like Tua's.

Video: Vitali Klitschko vs Chris Arreola (Full Fight) | UrbanMusicDirect