the desire to put in the work necessary to keep playing at the NFl level. He wasn't happy. Wasn't enjoying "the grind." And wasn't feeling fulfilled by trying. He chose to stop trying to play and intentionally moved on.
Not everyone who has the skill has the desire. The NFL is not for everyone. You have to want it to succeed. It seemed that Harvey wanted something else. Can't blame him for that. It is pretty cool he was able to recognize that earlier than later.