Because he's mega rich now. But lots of family and friend baggage. Some Bills probably know. Ty Johnson signed for like 5 million dollars. Absolute peanuts compared to what Amari has now. Ty would probably ask him for help with his mortage and stuff. Coop don't want that, you saw how quiet and introspective he was. He's gotta keep moving.
If you see Cooper sign with another team this offseason it will prove what I'm saying. You can't deny this.