Other than private/family stuff I can think of three possible reasons: (1) he saw Ertz go through the season and realized he’s gonna have to take a lot of punishment to play in our system, (2) he feels like he’s way better than Delton and if he’s not allowed to play now he never will be, or (3) he either knows or is convinced that Snyder is retiring.
I don’t see 1 being likely at all because you know what you’re getting in this system. 2 is possible, but if that’s really the case he probably is not as good as he thinks and won’t be that successful anywhere. 3 is also possible, but I think we’d hear a lot more rumblings if that were the case.
So I guess I really don’t have much reason to believe he actually would be transferring.