What happens if a coach benches a player for a game and thereby the player loses an endorsement? Can the player sue the coach?
What if the coach is sued for featuring one player more than another?
What if coach is accused of favoring one player in order to split an endorsement?
And so on...
You do know pro players have been signing endorsement deals for over half a century and not run into ANY of those problems right? So back in reality, none of those are problems. What is a problem is propping up a multimillion dollar league on players legally banned from making money.