Definitely one of the most shocking and memorable parts of the fic. I remember thinking this was the most amazing twists ever, and then I got to the NEXT chapter. 😕
Definitely didn't remember or connect this soul gems bit to the end with Chalenor affecting Mitch, even on my blitz reread. (But it was after all a *blitz* reread.)
On a related note, I obliviously read straight past Mark's passivity and it's only in your commentary that I realise you're consistently trying to explore and raise questions about that. (Again, though, I was blitzing and not in hyper literature-analysis mode.) You talk here about needing to be more subtle, but I'm reminded of some quote by Yudowkowsky about how in HPMoR he constantly felt like he was spelling things out but still most or all of his readers missed things.
Of course, not saying you need to write your story in a way only people like me will appreciate on a first read, and maybe it was actually completely unsubtle for most people and it was just me who missed it. 🙈
On less of a meta note, I do honestly feel like Mark pushing back against May would alienate her, and then Mark's influence might be lost altogether. Alan kind of does exactly that! Tackling your friends issues like this is such delicate work, especially when it comes to a friend like May. (He says "Good luck" and wonders if he just pissed her off somehow.) Mark didn't have the experiences, sensitivity, timing, or motherly nature of Stantler. By the end of the story I think he has the intimacy and understanding of her to have approached it, but that intimacy and understanding was partially gained by going through all this, and sticking by her when everyone else had written her off. (Not to mention, being the type of person who politely ignored her more annoying traits in the beginning of the story, even when they grated on him.)
He could have maybe said some right things if he was really careful and cautious, and I do think it was sort of his duty to try, but taking Alan's tack of aggressively calling it out would have demonstrably not worked, I think.
May, May, May–I just love everything May. Her complicated emotionality, and her friendship with Mark, and her issues, and ahhhhhhh. Kudos again on such a well-realised character. Not exaggerating when I say she's one of my favourites in all fiction–she really stuck with me since I was a little kid.
P.S. I DON'T KNOW ALL THE POKEMON ANYMORE, LET ALONE HOW TO SPELL THEM; YOUR SPAM VERIFICATION MAKES ME GRR!!!!