Agree with you bbcane. I think his previous diva moments and/or lack of McKinnie-esque fulfillment brings this on to an extent.
I went through this multiple times from 7th grade, jr high, into my freshman year at the U. It ranged from accidents, surprise deaths from illness and murder. Very tough to re-set yourself the very next second and go play or (as some seem to expect) just move on like nothing happened, regardless of how much is "at stake" in some fan's view of the present moment.
Any sort of game (or anything else) becomes trivial in comparison, and what you are doing with your life moves to the forefront. Merely existing, coping with it is likely where he is right now. Golden is an astute man who recognizes this, I am sure. Time and Seantrel will take its course and maybe he'll get it that nothing is guaranteed and goes for it with renewed passion.
At a certain point I am hoping that Seantrel gets back up, rededicates himself with a therapeutic total immersion that first provides him sanctuary in his chosen sport, and works to ultimately make him stronger as a person. Hope so.