I was just revisiting this post and have to chime in:

And how much his cat behaviour clearly has rubbed off on Zhao Yunlan. These two are wonderful together. ♥

So much! ♥

I think his first instance of losing his memory is back in the past, when he forgets Kunlun

Presumably as a result of being around the activated Hallows? I don't think he gets a head injury back then, does he?

Once he inevitably outlives the current crew

Ouch! The thought of him outliving them makes me really sad (even though it's presumably a cycle he's been through before...).