The Zhang fights destroyed Joyce

Yeah I know but Chisora is some kind of rock-headed super warrior mutant who keeps going to war and just when you think he's gone to the well one too many times and the well has run dry somehow he returns with a big pail of water.

He's probably the only other HW who can even come close to matching Big Joe for durability and engine, whereas, the vast majority of other HWs succumb to Big Joe's relentless pressure at some point during the 12 rounds and Chisora was a whisker away from doing so last night

A 40 y/o Chisora, as many wars as he's been in and as much punishment as he has taken, is still capable of doing something that very few of this current crop of HWs can do vs Big Joe. The vast majority of other HWs are going to succumb to Big Joe's pressure whether it's in round 2 or the dying seconds of round 12.