CC, A very interesting conversation. He's thinking about things and has come to realize that he's not been well. This a good step in the right direction. Continue to allow him to talk and validate him. At least he feels comfortable in talking to you about his thoughts on his illness.
Please don't try to analyze or assume anything right now. He's inching along and you don't want to scare him back into the rabbit hole. Continue as you have been, a nice, calm and soothing voice, as well as a safe place to land
Keep the expectations at zero!
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.