Musashi and Herk being Grands in those classes completely undermines the concept as it pretty much confirms "Grands" in their regular containers can be complete trash tier jobbers.

When Solomon was the only Grand Servant he supposedly solo'd a whole HGW in his normal container. Now a jobber who has been consistently displayed as weaker than Saber Alter and another jobber who can't beat REGEND suddenly have Grand containers despite their pathetic showings in the regular containers under those classes.