I will admit that Yandil admitting he was a Stalker felt outright impossible, like a contradiction, given the last two times Pokemon admitted to being Stalkers up front, there were... Noticeable side-effects. That he just up and did it clean was quite frankly one of the best covers ever, ironic as it must be. And 'probably' is not 'definitely,' though nevertheless, I just thought of one more problem.

Basically; the system of having gene-testing for Stalkers... Really simplifies things. Especially since most of the samples were unique; thus, we could practically cross off quite a few Pokemon just depending on which samples weren't Stalker samples, had we really paid mind to it. That seems too powerful for me, especially as that's a side effect of finding the pieces of the puzzle.

Extensive length aside, Season 2's sin purge ritual actually seems extremely well-designed, with sufficient perils and a lot of legwork in exchange for eliminating the guesswork of Stalkers-a rightfully powerful reward for all the trouble, though also slower and more dangerous compared to assassination/Exorcism.