>>And your diagnosis that he needs absolute sobriety.
Nope. He expressed Rehab as a goal and people encouraged him. The person who raised absolute sobriety was you and I'd bow to the opinions of more experienced people on this topic- I've come across as many mean or mopy drunks as the next person, but in treating them my experience is a fat zero.
"... They ne'er cared for us
yet: suffer us to famish, and their store-houses
crammed with grain; make edicts for usury, to
support usurers; repeal daily any wholesome act
established against the rich, and provide more
piercing statutes daily, to chain up and restrain
the poor. If the wars eat us not up, they will; and
there's all the love they bear us."
-- Shakespeare: Coriolanus, Act 1, scene 1