So we know that Reinhard is brokenly overpowered with all the blessings he has. (A google of "re zero reinhard blessings" will bring up a fair number of sources describing roughly the same list.)
Even if we assume that his grandmother Theresia only had the Sword Saint one "Sword Saint: Swordsmanship maxes out, and become able to draw Raid, the Dragon Sword.".
How does Wilhelm defeat her in a sword fight as witnessed in the anime, before they sort of become a couple. Does the light novel or web novel shed more light on this?
Or did Wilhelm seriously outfight the sword saint in a sword fight? I assume she still had at least the sword saint blessing, as their grandchild Reinhard didn't exist yet to take the blessing from her yet.