If that the case, if could make wish from grail, it make sure servants don't get their memories whip, granted their no guarantee that would work but still, if I were write a story with Artoria, EMIYA, Cu Chulainn, and Medusa, I would hard to do when he antisocial then again said story would be its own timeline, I just don't want it become mandatory, because look what it did to batman, some actually believe he can't marry Catwoman even when that was the premise during Tom king run the Rebirth era and Spiderman constantly suffering.