Floyd Patterson = Been floored over 20 times. Jersey Joe Walcott = Wasn't he floored alot in his career and KO'ed quite alot aswell ? Although I haven't seen enough footage to make a real opinion. Juan Manuel Marquez = I wouldn't say he has a glass chin, but he has been down and hurt quite a few times, I'd say his chin is definitely one of the weakest parts of his overall strengths, but his amazing heart and recuprertive powers make up for it. Wladimir Klitschko
At least Khan would get up and keep going. Price was far too big for the kind of guys that where just laying him flat with not so flush punches.
You can't be great by definition if you're glass-jawed. It's an oxymoron. Below average punch resistance is something to be mocked and ridiculed not celebrated. If you're packing glass you're a worthless subhuman freak and if you're a member of the male of the species and you're packing glass you need to be castrated so you can't pass on your defective genes to future generations.
Besides those already mentioned, Poison Jr Jones deserves a shout. Mark Breland wobbled every time someone hit his chin.