Spellfyre ch 16.5 spoilers ahead
Idk how I feel about this reveal. I think it was too obvious, and there's definitely more than what they'd have us believe. And idc, I still think I can bestiefy him.
Things I think we should keep in mind about the Flamekeeper (or whoever is behind stuff):
The reason Windworn ruled out MC as the Flamekeeper is that they use advanced magic and a first year wouldn't be able to pull it off. Keep in mind that Windworn believes that MC is potentially the most powerful arcane she's seen, so if she, a magic expert, still doesn't believe MC could pull it off, how could it realistically be Yvain, who is honestly kind of shit at magic? I mean, there's a scene with Cato where y'all can discuss whether it's Yvain, and if you say it's impossible, it gets pointed out that he can't control his magic well enough for it.
Yvain definitely doesn't have the power to pull off the dream stuff, so it calls into question whether Prof. Nightrun is involved, because how else would he have the ability? It sucks because she's my favorite professor, I think :(
Through the Cato scene, we've seen Yvain purchase shady stuff from Brimley, so clearly he's not above doing it himself, so how come he's sending people to do it for him?
If you explore the bombs in the Flamekeeper's lair, MC will realize that the FK was in the cave just before their (MC's) squad. If Yvain is a first year also, what are the odds he beat MC and co. there while doing the midterm AND buying himself enough time to set the bomb? Also, realistically, even if he's shown to be antisocial, he'd have had a squad, since we're told even two people on a squad is risky, so one person alone (especially one person who's not that great at magic) is literally a suicide mission. Not someone who's gonna beat all of the fuller, more experienced squads to the end. So how'd he get away with that without his squad noticing (and assuming they aren't in on it)?
Brimley was killed as he was telling MC where the Flamekeeper said they were from. I think this means that knowing where they're from is a significant clue as to their identity. Meanwhile, I don't think it matters much where Yvain is from, if we even know.
Windworn was quick to shut Yvain up. If that's not sus, I don't know what is.
While I do believe (and have said before) that Yvain thought that MC, as a Dreadbane, would be sympathetic to the cause before realizing that MC was probably brainwashed, remember that the Flamekeeper attacked MC literally on the first day, at which time Yvain not only hadn't met MC, but there was no way of telling where MC's loyalties lied yet. MC could've been (and was universally thought to be) Andros Dreadbane Part 2 at that time. Too early to decide to kill them if you're a devoted believer in Andros Dreadbane's cause.
I'm not actually gonna argue that the guy we've been seeing in robes isn't Yvain, because the sprites do line up perfectly (I was focused on comparing everyone's necklines to the FK's when the whole time it was a mf who literally just covered his with a cravat, smdh). Anyway unless they pull an It Lives Beneath and reuse one sprite for multiple people even if it doesn't fit (whitewashed cultish grandpa wassup), it's been Yvain, but I stand by the previous points.
There is more but I'm blanking rn I'll probably add later
Anyway, at the very least, he's clearly not acting alone. If it really is him and he's acting 100% of his own volition, which, *squints*