Kid Diamond hurt PBF but then again I doubt how much stock can be placed with that on account of Floyd's sparring sessions sometimes include 10-12 minute rounds so PBF might have been at the end when The Kid did his thing.

Foreman sparred with Liston, don't know if he ever KO'd him though
u havent rele thought this throu mate kid dynamite would also have benn at the end of the 10 - 12 min round so he would be tired as well so thts no excuse