DitchMarner
TheGlitchintheSwitch
I think PK Subban is a great answer. Once his speed and athletic ability declined, he fell off and was a shell of his former self.
Taylor Hall seems like a good answer as well. He wasn't really elite that long to begin with. He had two or three good seasons early on and then was somewhat disappointing for a short while before having his career season (in which he won the Hart Trophy). He won the Award near the end of his physical prime and promptly declined.
Someone like Ovechkin would be a bad answer. He was probably one of the best athletes in the sport at his peak and then successfully altered his style of play and continued to be a premiere goal scorer.
Taylor Hall seems like a good answer as well. He wasn't really elite that long to begin with. He had two or three good seasons early on and then was somewhat disappointing for a short while before having his career season (in which he won the Hart Trophy). He won the Award near the end of his physical prime and promptly declined.
Someone like Ovechkin would be a bad answer. He was probably one of the best athletes in the sport at his peak and then successfully altered his style of play and continued to be a premiere goal scorer.