This is totally me-extrapolating-from-what-I-know & could be completely off the mark, but I'm suspecting that the getting drunk thing was an act.

From what I've understood of his RL personality (and believe me, I'm no expert, though more I'm more expert than I'd like to be, which is "not at all")he doesn't like to lose control in any way.Tantrums, yes, but not deliberately loosing control to drugs or booze like the rest of us.

I could be totally wrong b/c this is all speculation--I'm sure someone who has firsthand knowledge could either conform/deny.