If Shannon Briggs is fighting for world title again at 45 anything possible. Amir is 44. http://boxrec.com/boxer/23704
Yes it would be finally accepted fight. Even the Stiverne fight is starting to look like "well he just beated one fat lazy bum."
Mansour need to get past the titty master Brezeale first, if he wants to get that title shot from the bomb squad. But he would be KO'd again, and he would get stopped against Stiverne too. Not quite on that level, entertaining fighter though.
Mansour is trash. Just looking for a pay day before he hangs it up. He's small, short, and has no head movment. It will be laughable if Wilder gets into the ring with a guy under six feet tall.