No but he didn't gain muscle mass, Foreman did and was probably roided up in his comeback. Baer probably didn't have access to such drugs
So what he gained if not muscle mass? He wasn't flubby at all, he looked extremely fit at over 220 lbs.
Now I am going to dispute that. While it is hard to say who hit harder, Baer was stopping better fighters than Foreman in his comeback, or Tua at any stage of his career. I am going to call it that prime Baer was a more dangerous finisher than either of these men. This also I would have to dispute. who did Moorer actually stop, to suggest that he was a more dangerous puncher than Schmeling say?