Toney made Holyfield look like a mug. Holyfield then went on to get "robbed" to the massive Valuev who was "world" champion. Ruiz was "world" champion when Roy mugged him off.

So bigger means "better" isn't the case. A middleweight was able to not train properly, weigh in as a fat man, and beat an all-time great heavyweight that a few years later beat a humongous "world" champion.

If they didn't seperate weight-classes we wouldn't even be having this discussion. You'd have no idea if Floyd could beat Wlad, like we don't know now.