I mean, for Floyd to allow Connor to knock him out..
I know Floyd is a businessman
, but man, that would be hit to his legacy for sure.
The would both make a bank on a rematch, though.
Floyd's legacy is more important to him than the money if anyone can actually believe that.
He marketed himself since the DLH fight through his undefeated record. It was the element about him that helped promote him into the biggest PPV star in boxing (that and his antagonistic demeanor.)
He won't let anyone knock him out, let alone hit him flush. Even though McGregor has very basic boxing skills (amateurish at best,) he does have a very strong left hand, good counterpunching ability with overall good timing. A flush shot from him could definitely hurt Jr, and I can't imagine he'd allow himself to be susceptible to getting hit flush by anything from Mac.
There's a couple boxers that Floyd can fight with minimal risk attached to it that will yield him a 9 figure payday. If he really wants another 100+ million dollar check after this bout, a rematch with either Canelo or Manny Pacman (as long as he gets through a rematch with Horn,) would get him his quota.