How would he have fared. Unbiased please too many guys go against Aussies. Tszyu was good he beat some calibre opponents.
Tszyu would make Trinidad miss and pay; he would get inside these lanky arms and find his chin, which was never very good.
I'll preface this by saying Kostya is definitely a deserved HOF'er.................but he goes 0-3. Tito doesn't lose to smaller frame fighters with less length (it's a physical stylistic foil). This has never happened at any point in his career. Kostya isn't the type fighter that gave Floyd trouble and he's not going to out duel him. Also Kostya's right hand would be taken away by Mayweather (straight rights and looping rights don't land clean with Floyd's type of defense and Kostya's hook isn't a real issues). Floyd was also much longer so would win the jab contest and was much, much faster off the counter. He could honestly pot shot to a victory. Kostya would have the best chance vs. Mosley but a 135 Mosley moving up to 140 I'd favor Mosley (physical strength inside, hand and foot speed advantage, arguably power and durability advantage). Also all 3 of those men I'd argue have superior stamina to Kostya, I'd like to say durability as well. There's actually some guys that made it rough for these 3 I think Kostya beats. These are just bad styles for him
I think Zoo could beat Mosley and Mayweather at 140 pounds, I don't know that I'd favor him though. It's not a wash like people think and people act like Mayweather is untouchable even though Corley had him hurt badly around that weight. Mosley fight would be a war. If you believe it's pressure fighters who beat Kostya, that isn't Mosley or Mayweather. I won't predict the Trinidad fight because Kosyta never fought above 140 pounds. You'd have to favor Trinidad in that matchup, probably by stoppage.