I'm thinking Flora should have "higher with prep" added, since the World Tree is a srsly fuqn powerful Astral phenomenon (reality warped the entire world which is High 6-A or 5-B, and merged two planes of existence which may have different spacetimes, which could be Low 2-C), and she was holding it back with her efforts in cultivating and preserving the spirit woods
My bet is that Griffith gets neutralized by having his emotions like remorse and empathy restored (likely by Farny and Schierke after mastering magic), and his psyche snaps under the strain of his sins.
It almost breaks my heart more than news of Miura's passing. Miura-sensei had a much larger impact on my life than Morikawa-sensei, being the author who got me back into anime and manga after a dry spell of a few years during Attack on Titan's anime hiatus, and helped to shape and mature my taste in media. But Miura was so much more than even that to Morikawa. His friend, his rival (so arguments can be made for best friend), and from what I've heard, was even his one-time student/assistant. It's gut-wrenching to even hear of it, of a man so hopelessly distraught by losing one of those closest to him that he shuts himself in his room and elects to wither away. I can only hope that his loved ones succeed in getting him the support he needs, and I extend my deepest sympathy and condolences to him and those closest to Morikawa-sensei and Miura-sensei. I need time to process before I can go writing a eulogy, but what I can say is: thank you, Miura, and farewell.
