Below is spoilered in case anybody hasn't seen the major spoilers from before the beginning of cour 3, which is probably no one, but anyway.
I recently realized that the main reason, that I haven't been enjoying cour 3 as much as the previous ones, is that they just spoiled Viola and Neige from the get-go. Because of that, I've been judging everything that's been happening with Sumire and Lily not at face value, but from the perspective of them eventually joining the team. While schizo tomboy and iPad kid make for decent villains, I can't see them as heroes, especially not Lily. Sumire pre cour 3 would fit with the good side in general, but in my opinion, she doesn't fit well with our main characters. I really would have preferred to go into the second half of the show without major spoilers...