Yup he spars medium a lot but then peaks with all out sparring but not as much as others. The human head is very delicate. Many boxers suffer eye problems, broken noses, concussions, it's not good to go all out in sparring all the time. If you have two world class boxers sparring medium they're still learning just not taking the concussive blows.
Not studying tape, I can buy, a number of fighters don’t. But I doubt he means he doesn’t spar AT ALL
He should have studied a puncher like Kov though, he won`t have time to adjust if he gets caught ill-prepared, he can`t just wing it.
Hes still not walking away with a record like he has and in a title fight without sparring. As has already been said multiple times, its essential in getting your timing and distance judgement, and also in your accuracy hitting a static target. Not possible.
He does spar. But don't use top guys because he light spars most of the time. Is he thinking of the long term affects of hard sparring ? or is he worried about his chin? We will find out soon...…...