You're joking, but watch Nasu come in with "Only Masters with 7+ Servants can qualify, and we didn't have any, so we just said it's not a thing". They'd could easily have Independent Manifestation from all the Rayshifting too, so summoning themselves isn't out of the question either.
Oh god.
>Destroys humanity out of a love for humanity (see: trying to save PHH and in doing so is essentially Marisbury's henchman- even if Marisbury winds up being truly dead)
>Independent Manifestation (Rayshifts to wherever and whenever)
>Nega Skill (Stated to "always win the second fight", because once he knows the enemy's weakness he can ALWAYS summon the perfect counter)
>Treated as an OP trump card even among Servants (see Traum)
>Compared to a "Beast who succeeded" in story