This is all opinion, so not saying mine is valid and yours isn't, but undefeated fighters are the hardest to defeat.(as the saying goes). The version of Judah that Kostya beat was the best version we saw (MUCH better than the one Cotto and Paulie beat), and Kostya destroyed him. Master is right when he says Judah came back for some decent wins after, and even showed glimpses of Great potential in some losses, but Zab became inconsistent after that first loss.
I also don't think you give Sharmba Mitchell as much credit as he deserves. Mitchell was a very good fighter, with solid boxing skills and good speed. Kostya definitely doesn't have the quality of opposition that Manny, Hop, Evander, Oscar...etc. had, but he didn't duck or fight weak opposition either.
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