#2 Diminishing skills
Anderson Silva used to be the fastest, he used to be the strongest and he used to be the baddest. Nobody could even come close to touching him, and we mean that in the most literal of senses. Whenever someone threw a punch it was like their hands were going in slow motion, meanwhile Anderson could dodge, duck, dip and dive like he was playing a game of Dodgeball.
But not anymore. The second he got clipped by Chris Weidman that illusion was shattered, and his follow up leg injury in the rematch didn't help matters either. You can pull out all the terminology you want about the fight game but at the end of the day, nothing matters if you can't consistently perform at the level you expect of yourself.
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Anderson has some phenomenal talents, but perhaps moving into a coaching role is the best thing for him.
The final selection is a much more business-related matter.