From 85-89 Tyson was always in fantastic shape, and he was making an ok attempt to come back post Douglas too before being put away for 4 years which took away much of his chance to show what he was or wasn't made of post first loss. Norris had some talent, no doubt. His chin let him down once (but he did avenge so fair play) and he also had a weird dangerous penchant for hitting people on the floor. Oodles of ability tho.
That's boxing, maybe he should have took the signs and got out i wonder. Wasn't Gerald dehydrating and rehydrating all the time too? Wouldn't mind betting that played a huge part.