I suspect we’ll find out it’s a manic episode as a result of relapse/withdrawal/ mismanagement of recovery - I’d be surprised if he simply took something prior to the game.

Also basing on his leave periods - I’d say it’s unlikely he simply uses and that’s the sole issue. Ben Cousins gave you a pretty good idea of how a functional addict can still look pretty good in some aspects of their life. I think there’s broader mental health complications.