Vitali certainly won't unless he does something special in the next few years. Only to his merry band of nuthuggers will he be ranked that highly. Sam Peter and Chris Arreola being the highlights of your boxing career don't make for an ATG record. Wlad maybe so, he's fought many good opponents over the years.
This is a very good point....when you fight 6 - 8 times a year you are bound to slip up somewhere along the way just from a conditioning point of view. Also, and something that I hadn't previously thought of, old time fighters didn't have the benefit of video footage to study an opponent so more often than not they would be going into the ring with absolutely no idea of the others mans style, strengths or weaknesses.
You'd have to include Witherspoon as an exception too but I take the point, if you are going to lose, lose to Mike Tyson and Lennox Lewis.
I've got a humdinger: Jose Luis Ramirez Only ever lost to (in this order) Ruben Olivares Alexis Arguello Ray Mancini Edwin Rosario Hector Camacho Julio Cesar Chavez Pernell Whitaker Juan Martin Coggi