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I'm not sure I agree. I think as fans we like to look into things into too much depth sometimes. Wilder probably just wanted to make a statement, that he hasn't got time for the mind games, and just wants to get to business. Unfortunately, that message wasn't received, and now people think he isn't ready or mentally broken as you described.
The stare down was a weird and it was basically both holding their ground showing their dominance and nothing else and when both were not making any other moves for minutes the team members of Wilder has to talk to Wilder and asked him to settle down and like you even i do not see anything in that.
I'll be honest, I'm team Fury in this just because it leads up to one of the biggest fights for a while. Fury VS AJ. However, I think Wilder will be just as ready as he was for the first two fights. The man might not be a brilliant boxer, but he has one hell of a punch which can put anyone out. The first fight, despite me thinking Fury won, it was close (not on points in my opinion) but was close due to the fact that Fury nearly missed the count. It was a big punch, that if he can land again will likely put Fury on his arse once again.
I am also a huge fan of Fury and i want this fight to get over and i want to see Fury and Anthony Joshua so that he could cement himself as the dominant boxer of his generation and despite all this it is a dangerous fight as Wilder has that knockout power and that is the only way Wilder could win this fight.
Heard many stories that Wilder was training for long hours on a daily basis every day for the past one year and he was not even doing anything else but training and even changed his trainer and it is interesting to see what all adjustments he made.