Wow. I know I am not part of this business at all but should things like these be documented for exactly someone in your case (by that I mean someone who needs to catch up the thoughts behind the story to write it on) ?
I have to admit that I am a bit bitter to see how such an iconic character like Palawa Joko got handled. Nostalgia being a huge factor here for sure but he is one of the most memorable character of GW1 and before PoF we only had rumours about him. Then we met him in total 3 times before we killed him. For 10 years people were wondering who he was, how he got his power and more recently how he escaped the domain of the lost .... Maybe you have something on the shelves for us, but I feel it could have been presented to the players before (at least partly).
I like how he is ending though, for all the reasons you listed in your very insightful post. But even if you wanted to have him out now, I think giving us more lore before (through in game books, ...