Im thinking Wladimir, Haye, Wilder and Price at the minute. Not too sure about the other. Povetkin maybe? Whos yours?
Definitely doesn't belong on current lists, but prior to his retirement from various injuries, especially his shoulder, he DID have legitimate one hit KO power. After his return, he became much more of an arm puncher.
Wlad, Wilder, Price, Haye and Boytsov. I would also include Helenius but he hasn't looked good since his injury even in terms of power. Stiverne could also be in the list I'm not sure if Haye is top 5 in terms of pure power but I'll just rank him ahead of Stiverne. Oh and I forgot Travis Walker not much else but he has great power
Wlad Haye Wilder Stiverne Price Though it's just being presumptious with the last three, haven't really knocked out quality but the KO's i have seen have been lights out stuff.