IMO he doesnt he deals with it well. I think hes mentally very tough. His legs though.. Whole different story..
I constantly criticize his boxing fundamentels... But I said during the fight that i was impressed with the fact that the fight was going exactly how he wanted and said as soon as round 7 ended that he would KO Ortiz. He was hurt, there's no doubt about it. But what impressed me was the way he shook his head during the 7th. It wasn't your usual "I'm going to pretend i'm not hurt even though i am", it was a shake as if he was annoyed at how easily he was getting caught.
Wilder is a difficult boxer to forecast what he will do as he is so unorthodox that he always pulls a rabbit out his hat. Nice observations in your post