Walkinganewpath....I'm glad that you are feeling more settled as you are facing this tricky situation.
Having spent most of my life in a hospital...I can reinforce this to you: Be certain to open your mouth and let everyone that you can speak to know what is really going on. You can be certain that he won't!!
My mother, while, she was still living (in her 90's), used to lie to the social workers, doctors, and everyone else....so she could get her way. She wasn't an alcoholic, even...she was just very, very stubborn.
If the staff thinks that you are o.k. with him coming home--they won't try very hard to find a better solution.
All I am saying is----just stand your own ground. If you don't--ain't nobody else gonna..
dandylion