Probably couldn't choose who to pick from there. Amakusa Shirou and Semiramis? Shishigo and Mordred? Astolfo and Cardboard-kun? Astolfo and the psycho-bitch-whose-name-was-never-once-mentioned-in-the-anime?
If you knew why sugggest Mash? She's not Saberface. Cuz then you should also criticize Nero's inclusion if so.
No, you can also interpret it as protagonists/main characters and their partners, hence Lord El-Melloi II and Gray. And while not a 1:1 Saber-face, Mash is still a Takeuchi-face, which... certainly counts for something, knowing his "diverse" artstyle.
My dude, you are being incredibly silly. The point is that they're Saberfaces. All of them are Saberfaces. Gray being a Saberface is in fact a plot point for her as a character. This is a collection of protags and their Saberfaces.
No, you can also interpret it as protagonists/main characters and their partners, hence Lord El-Melloi II and Gray. And while not a 1:1 Saber-face, Mash is still a Takeuchi-face, which... certainly counts for something, knowing his "diverse" artstyle.
Caster Artoria is very explicitly Ritsuka's designated companion Saberface. Mash is not.