If everyone from the top 10 HW fought opponents like Derek 'War' Chisora during their career, boxing wouldn't be "in crisis", it would be the most watched sport in the world.
Because he's never held a world title yet earns and sells tickets like he's a current world title holder.
And his record against that list is 4-14. In 2023 he went on a little run before that his record against that list was 1-13. The reason this is a problem is usually someone who loses half that much would stop getting big fights. Fighting everyone and going .500 isn't really an option in today's sport. So the notion that Chisora took all these challenges everyone else was too scared to do is faulty. I remember back when he had 13 losses there was like 1 or 2 guys in the top 200 with more than 5. Chisora is a rare EBU/Commonwealth double winner but he got that done in 2013.
Chisora is the greatest of this era in terms of who he fought against. Whilst the others were protecting zeros, he was taking on all comers