Glass chin is just a name. He would be the easiest fight. I dont even think he can beat brook or thurman. Got punished around in 140 and trying to talk his way into the top of welterweight.
I think Khan.
Thurman would have to be the aggressor against Floyd and that doesn't suit him, he's better on the backfoot.
Brook is a classic 1-2 fighter, he's very good but too basic to beat Floyd imo, doesn't offer anything Floyd hasn't seen.
I think Floyd will definitely fight one of these 3 in September.
brook is tailor made, floyd would white wash him easy. no way in hell a counter puncher is going to beat floyd
thurman is too open defensively and doesnt have the volume or skill to trouble floyd
amir is the only one who can win a few rounds before getting knocked out
Thurman!
He's the guy who will be able to keep up with Floyd's movement, corner him, throw and land at a high frequency every round.
He has the best connect percentage of those three, and hits the hardest.
Don't think any of them would win but I'd say 1) Khan 2) Thurman 3) Brook
Khan has a good jab, legit hand speed, foot speed and a long reach but can't fight on the inside and can be hurt.
Thurman is agile, decent jab, good power but is wild, open to counters and looks like he can be frustrated
Brook is a bit of a wildcard. He has a solid jab, good power and is big at the weight. But he seems flat footed and would struggle with the speed and movement.
Surprisingly, I think I'll say Khan. For the first time, I think Khan might do it. Thurman's too inexperienced and has too many lapses, and Brook's too much the kind of guy Mayweather likes to fight.