I honestly don't know Aquiana, but if he never heard of 90 in 90, my guess is he's trying to do it all on his own. Perhaps someone who is in recovery can better answer your questions. I can only go by what the alcoholics in my life have done.
Recovery is up to the A .... the program is the program ...... it's not "modified" for someone because of their personality quirks. It is what it is and from what I know it's not changed for anyone.
BTW, my husband never once mentioned and still doesn't that he is going to AA. It's part of his life now. He simply doesn't drink and works the program.
I wish I could believe G was going, but my gut tells me he's not. I HOPE I AM WRONG and I hope you can toss it back in my face someday, I really do.