Originally Posted by
Lily Emilio
Nasu did said the "brain of the planet" still exists in Fate/Extra, apart from fanservice Arc, that is the equivalent to CM. So we don't know if that "brain" is the same as Arc, or based on CM, or Arc but not called Arc. We do know he exists in all timelines and got defeated in 300AD by Zelretch, and in Fate timelines True Ancestors also exist (the Church mistaken Yu Meiren as one). so it is safe to assume that the True Ancestor project still happen in the background despite the DAAs as a collective does not exist. Nasu also said that putting Arc in FGO wouldn't change her performance much, which indicates that the planet still recognizes her as its brain regardless of timelines. This means whoever the "brain" of the planet in Fate timeline is, they should be very similar to Arc.