Originally Posted by
Twelveseal
You know what? I feel like the Zelretch Observer idea is BS.
Tsukihime is stated to not have Servants and such because some garbage about humanity, at least after Tsuki and Fate were retconned into separate timelines. Yet Zel "currently" exists in both timelines; as a DAA and Wizard Marshal in Tsuki, and in his HF intervention and historically by intervening to create the HGW itself by bringing the Founders together.
Yet these two timelines should be mutually exclusive due to the decline in humanity that leads to vampires being common in Tsuki. If Zel Observer is accurate, either there's multiple Zels, or the canon timeline changes to be whichever one he's currently in.
Which means there isn't really a canon.
Or perhaps I should say it means that no part of Tsukihime is canon if Zelretch isn't actually present anymore?
No, actually thinking about it, doesn't this mean that basically nothing but Heaven's Feel is actually canon in the official, Nasu-made content? That timeline vetoes Tsuki, GO, EXTRA, maybe even KnK and Mahoyo...