Musashi is not a grand servant, but her act is nothing short of grand equal

Zeus was powerful, but they didn't exactly required a true grand servant, Romulus=Quirinos fought Zeus without burning his grand saint graph, thus, he's still eligible to hunt a beast unlike Orion (the weakest grand) who already used his eligibility to hunt Tamamo Vitch,

Musashi's act of closing back/driving away Chaos required her to burn her entire saint graph, leaving herself completely erased from the throne,

so, the question is, which non grand candidate is capable of grand acts?

Archetype: Earth by merit of being Gaia's, who else