Here's my take on Von Miller... at 33 years old... he probably thought he was almost done. His numbers were down from his previous "superstar" days, and Denver traded him for peanuts and, IN ADDITION, had to eat his contact. So everybody knew he was not the same player that he used to be.
He comes to LA, teams with AD, and boom... he starts playing like the old Von Miller again and definitely helps the Rams win a Super Bowl. He loves LA, he loves playing with AD and OBJ, but the Bills come calling with a mega-deal and his ego makes him believe he is the old Von Miller again. His agent and his father start telling him he'd be crazy to pass up that money, and he ultimately agrees to go to Buffalo.
He signs the deal, then has remorse because he never wanted to leave LA and the Rams in the first place. My guess is that we will see the guy that left Denver playing for Buffalo and definitely not the guy we saw in the playoffs. He doesn't want to be in Buffalo, so he will just go thru the motions until injury or the retirement bug sets in.
JMO.