If Chito was getting better as the fight went on ok maybe, but Sean was landing more strikes every round, Sean was getting better. Eventually it will be one punch too many, something would break, his body would give out, he would lose. He got the shit beat out of him for 25 minutes straight and Sean was not slowing down. The damage only adds up.
He can tell himself he's tough or whatever, but everyone has a breaking point. Eventually it would look like Tony Vs Gaethje, Chito would break and quit, he's a human being. I think Tony is probably tougher anyway