On a serious note yes nearly every elite professional boxer will be punch drunk in one way shape or another. 1000's of rounds you cannot swim with out getting wet.
No , buts it a rather simple equation Stupid + Needs attention every second of every day = Deontay Wilder.
Every fighter sustains some levels of brain damage. George Foreman himself said he suffered lots of memory loss from being a fighter even in his mid 20's. He said memory loss and other forms of brain damage are the price of being a fighter, but the glory and money make it worth it.