I get it..he tore up his arm and elbow..horrific pain. Yet,he did recover. Only as we saw the fear of getting hurt controlled his every move.
When you make millions you tell yerself you don't need that shit again,not go through that EVER again.
Hence when fans and coaches were vocal at his delicate nature? His attitude changed to " I just have to show up". He got obnoxious. I think he just about counted up the minutes he played. Over that, he quit with the effort.
Dallas will see the same thing eventually.