Both John L and Fury ballooned after becoming the champion. I think a Prime vs. Prime would produce predictable answers in this thread. So I want to take another angle that tips the balance more in John L's favor. Prime John L vs. Current Tyson Fury! Who wins in 12 rounds? This content is protected vs. This content is protected
If you are assuming that Sullivan comes into the ring in fighting shape, and Fury effective comes in obese off the street, then I think that Sullivan would almost certainly prevail.