> Seems really immature

I don't think it's fair to say he's being immature. Football is a business and he's trying to get as much money as he can. Totally reasonable. There are dumb franchises out there that will give absolutely awful contracts to players and he gambled that something like that would benefit him. Unfortunately for Lamar the disaster of the Deshaun Watson contract in Cleveland appears to have knocked some sense into idiots like Dan Snyder.

I do agree that he misjudged his value on the market and would be better off with an agent.