It's confusing that you're using quote marks for "top" when no one's used that word to refer to Bivol that I can see. The only post in the entire thread which yours seems to be a reply to is the one directly above yours which you didn't quote, but you say "all these comments" -- every other comment mentioning Bivol so far was just talking about the potential rematch.
Bivol's been ranked as usually the best or second best guy in his division for about 4 years, how's that not a top guy? If you're saying that you don't think Bivol is a p4p talent head and shoulders above others then that's different, though he's still better than most of Canelo's resume obviously, regardless of weight difference.