Before guys like Thomas Hearns, Wlad Klitschko, Roy Jones, Terry Norris, etc. who were some of the earliest boxing champions back then that was labeled as having a "glass chin".
Roy Jones chin matter didn't begin until his mid-30's. I think it was more a matter of him relying on a young man's fight plan after his legs and reflexes got old. Waldo also had more a panic/pacing problem. Manny helped him learn to manage that. I wouldn't say he has a stout chin but I wouldn't say he is chinny.