Apples to orange, in my opinion.
Physical maladies can be tough to deal with, but aren't deal breakers. If you can handle the pain, which is a big ask, you're fine. Your mind is still sound.
So long as you aren't paralyzed, you aren't paralyzed. There's no in between. Ditto for death. You either come out alive or you don't.
Disfigurement is unfortunate, crippling injuries even more so (especially if they cause pain), but they pale in comparison to CTE.
There is no way of diagnosing CTE, there is no way of knowing if/when it will occur, and there isn't a telltale cause. It seems that repetitive sub-concussive head injuries cause it.
Again, these guys are warriors. They often can handle the aches, pains, and physical issues that ensue after playing football. But if your mind isn't right, there's no amount of toughness that will make you right. Depression cannot be toughed-out, nor can dementia, etc, etc.
The brain is a different animal.