Jersey Joe Walcott in his prime , whenever you think that was, versus the motley crew of Corbett/Fitz/Sharkey/Jeffries ,we will cut it off there. How does he do? How many,if any does he beat? And,which ones? 15rds, 50's rules ,and gloves.
If you're making these fights on Walcott's terms with 1950's regulations, then I think he beats all of them. He's too slick and tricky for Jeffries, too big and durable for fitz and just too good for Corbett and Sharkey.
I don't know that Walcott was particularly durable,Charles floored him and he was not a big banger at heavyweight.