Berbick was incredibly powerful, and he relied on his brute strength to push his oppontants back and then unload. He'd have some trouble doing that with Peter here.
Berbick. Just as strong as Peter. Faster, better skill, straighter punches and better defense. I would even say the chins are about the same. Everything Peter can do, Berbick can do, only better.
You don't have respect for Berbicks chin? He was a durable HW who was only ever stopped by Tyson and hard hitter and forgotten fighter Bernardo Mercado early in his career. He went the distance with guys like Rahman when he was a shot fighter as well...
Berbick is nothing special. People forget just HOW bad the post-Ali, pre-Tyson era in the 80s was. It was every bit as bad as the current period we're going through now. Berbick was a very ordinary fighter. Peter is not great, but he does have the great equalizer that Berbick does not have. I think he gets him out of there.