And his brain.
I've heard/read that getting hit hard once, KOed and shutting off is less damaging than many repeated blows even in a case like this that does not result in KO.
Kelvin took at least 1/2 dozen KO type shots. He was dropped HARD more times than I could count including multiple times in short succession in the 5th. (The fight could honestly have been stopped in round 5 and probably would have if it weren't so close to the bell).
Kelvin absolutely had a concussion (maybe more than one) and took multiple hard shots after having a concussion.
That fight will affect Kelvin. Maybe it results in less of a granite chin, maybe headaches, maybe dimensia in 60 years, but it will affect his brain.
I wish him the best and hope his skull somehow defies science