Khan's going to be fine after boxing despite being knocked out several times. It's these guys like Provodnikov who are able to eat so many punches that will have dementia by 40.
Khan has been beaten up quite a few times. Limond, Maidana, Peterson, Garcia and Diaz put some serious hurt on him. And those two knockouts that he suffered at the hands of Alvarez and Prescott, those will have their effects.
Talking about the size of it, plus he took some of Vlad's best shots and stuck around we saw what happened to pulev when he tried