Did you watch the documentary? He hasn't played a meaningful snap since he was 28. When he was on the field in the NFL he said he couldn't feel his body and was constantly dealing with panic attacks and anxiety. I'd imagine that didn't help his play at all. The whole thing was way more forked up than I ever thought.
Finished it. FWIW, he did say that his anxiety issues were during his first 3 seasons with the Chargers. He played several seasons after that, so apparently he overcame it or found relief of some sort.
When he was with the Saints, I remember him being very consistent and effective for us in his role.