I'm trying to make a map of where certain timelines split from the linear path of the Proper-Human History.
So we know (or at least theorize) that the point where a certain timeline split into Tsukihime and Fate worlds is during Zelretch's fight against Crimson Moon. Whatever happened then was significant enough for the Human Order to grow weaker with time and the 27 Dead Apostles to exist as a group and vice versa.
This however leaves Kara no Kyoukai and Mahoyo.
KnK's is pretty easy to say comes way after Zel v Brunestud. It's said it can't exist in the same universe as Tsukihime because there can't be two pairs of Mystic Eyes of Death Perception (for whatever reason).
Mahoyo is also different as there are a number of inconsistencies such as the Aozaki's ages and the fact that the house Alice and Aoko stay in is apparently that timeline's Tohno mansion.
Do you guys know more?
Also, is the Moon Cell a thing in every universe? Just... undiscovered? Wouldn't that make the concept of Brunestud as Type Moon kinda weird? Unless I'm an idiot and the Moon Cell is just inside the moon and isn't really "part of it" so to speak.
Again, sorry for the noobie questions. It's hard to find all the info when some translated mats don't really address such topics.