Biggest 180 that occurs to me from your thread is to do the opposite of controlling...(you can let your control genie out with your L to look after your own needs, lol!)
So, I guess that would be listen, validate, don't interpret what he says, don't try to tell him what you think, lots of 'well, I need some time to think about that' and 'what's your suggestion about x'.... Tough though, so I'd keep the meeting REALLY short. Best guess is that he's doing it to 'get things sorted' (but will either have no clue or a ridiculous plan) and to scratch his venting itch.
You said wisely that you're not doing it to negotiate stuff...what's your purpose and objective for the meeting?
Me: 53 H:38 T:20 M:14 BD ILYB etc 10/15, H diagnosed severe depression S 1/16 PA 4/16 H filed 1/17