They met when they were the 2 best boxers in the world and Floyd won, and Floyd had never lost before that nor after than, Manny has.
Floyd fought both Cotto and Oscar at 154, didn't Manny fight them both at 147? Those thank rank Manny above Floyd just hate Floyd for being a horrible human being. Also, remind me, at what weight was it that Marquez KO'd Manny? 147 right? So Marquez clearly was big enough to do that 3 years after facing Floyd when he was 39 years old but wasn't big enough when he was closer to his prime?
Was Tarver undefeated his entire career with world titles in 5 weight classes and beat more champions in the history of boxing? I think that's the difference here.(comparing to Floyd here)
And no one would rank Tarver ahead of Jones, BUT, they certainly are going to use that to rank someone else ahead of Jones. If Roy retires after that first fight I think we have a serious argument about placing him as the GOAT but he didn't and he's fallen so far from where he was.