If we speak just in terms of power, I still think Wlad. he doesn't go swining and throwing everything into his shots yet still has done some serious damage to people.
Klitschko, Wilder, Price, Haye, Joshua, Helenius, Stiverne, Parker, Ortiz, Povetkin..............Briggs, Ustinov...I've never seen Martin
AJ looks more like a cumulative puncher to me. Wilder hasn't KO'd a legit opponent, but he unquestionably carries a lot of power. It's unquestionable that Haye is a devastating one-punch KO artist (presuming he is injury-free), and, despite the china Price is packing, his power is immense. Helenius has a big dig as well.
Wlad "power" is effective after he hugs his smaller opponents who had to eat jabs & carry his weight for a few rds. Wlad lack of power showed up vs Fury & hints of it vs Wach...Povetkin did what Wlad couldn't do :smoke
He probably has pretty damn good power you let him wind up and get a run at it, without someone returning fire. Which, of course, doesn't happen in the real world.
1. David Haye 2. Vladimir Klitschko 3. Luis Ortiz 4. Alexander Povetkin 5. Tyson Fury I'll put Wilder in there when he knocks out a good fighter.