Wlad had around 40 fights under his belt at that time, and by doing the math he was a pro for 7 years when he lost to Sanders and was a pro for 8 when he lost to Brewster. He was also around 28 years old at the time, which is about the same age when most athletes hit their physical peak. So let me ask, what was Wlad's 3 best victories? Bryd, Peter, Chagaev? Who the hell is going to remember that bunch of crap heavyweights? Wlad has yet to face a really good heavyweight, let alone a great one.
Weakest ever was the late 80's. Tyson never beat anyone above a 'can. In the 90's he was obliterated by fighters that could actually fight.