Funny you mentioned McCline, he's one of the ones I was alluding to. He was square in the middle of the best streak of his career (Whitaker may be the guy you're thinking of, btw) from 2001-2004, and Wlad took him apart. It's also notable because McCline himself was a huge fighter- Wlad enjoyed no size advantage there. People can say what they will of the early 2000's, and nobody likes it compared to the 90s from an entertainment standpoint, but it was the deepest period ever for "superheavyweight" sized fighters.
Here is mine in order: Povetkin Byrd I Byrd II Haye Chagaev Ibragimov Peter I Pulev I do think that is the relatively clear cut top 8, although the order is highly debatable.
Better than; Jim Braddock, Tommy Farr, Harry Thomas, Jack Roper, Al McCoy, Red Burman. I think a boxing historian could make a strong argument that the current heavyweight division is actually the 3rd best cast of characters ever.
In no order Haye Povetkin Peter 1 ------------ Byrd - He is here by default... yes a good fighter but really, h2h he doesn't pose much danger to Wlad and wasn't going to outbox him. ------------ The Peter fight might seem odd to many, for being on this list. But that was just a horrific matchup for Wlad, at a very vulnerable time for him. A big, strong, durable power puncher coming forward and throwing bombs for 12 rounds... and Wlad endured the adversity and won the fight. Peter might not have had a good career but that night he was a dangerous fighter at his peak and Wlad dealt with him. Not going to name a 5th.... can put a few names in that spot, Ill just leave it blank.
Haye Povetkin Byrd The rest are a bit too rubbishy but then the three included aren't great , haye was pretty much still an unknown at the weight , Povetkin was fouled blatantly throughout the ref was wlad's third glove and Byrd was certainly past his best