Ok, I'm not trying to make this what it'll probably turn in to, but more people than Kaepernick kneeled. Eric Reid was also a huge proponent of kneeling, and he's still in the league. The NFL is a business, if you can play, you will make your way back to it. Kaepernick is a unique situation because he was blackballed, and the NFL did make an example out of him. But, I bet if it was say, Cam Newton, when he was winning his MVP, he would've still been in the league.
But, Walton will never get another shot because he's not Tyreek Hill, or Adrian Peterson in his prime, nor should he. You have to be a very talented player to get away with stuff like that- the most recent example would be Kareem Hunt. If walton had done the same thing Hunt did, he would never get another opportunity, because he's not as good.
I'm not starting this Kaepernick/kneeling debate, but those are just the facts