Helenius who beat Peter, Liakovich, and Attila Levin would easily KTFO Wilder. He has better chin and hits as hard as Wilder.
What would be the point in fighting Helenius? If Wilder fought him and beat him then a large number of people that said Helenius would win will simply dismiss Helenius as being shot, shop worn, done, utter garbage etc.
The guy who got totally out hustled by Chisora? No thanks. We'd only have to hear about injuries being the cause if a rapid decline following his defeat. If you're desperate for a world ranked contender to ice wilder Povetkin is prob the man for the job.
Helenius will be back in 2015 (he announced it on Twitter) He's only 31 years old, so he can still have a shot at Wilder or Wlad or anyone else if he can get himself in shape.