Originally Posted by
CCC Keyword 02, Gilgamesh
Reiu's translation:
Gilgamesh is the original, other heroes are his offshoots → other heroes have NPs → therefore Gilgamesh, as the original, must have had the prototypes of their NPs, because otherwise where else would the NPs have come from? → it becomes so that he does.
GoB is the manifestation of this rule, so that it doesn't just contain what he acquired when he was alive. At least that seems to be the currently agreed upon interpretation among the Yamato
breakfastcontinental's translation:
More or less, the heroes of various myths are derived from Gilgamesh's legend. As such, Gilgamesh possesses the prototypes of the Noble Phantasms that heroes carry... the original treasures from before every legend was arranged. Though it may be a paradox, unless the original, Gilgamesh, possesses it, it cannot be handed down as the Noble Phantasm possessed by the later heroes who were derived from him.
food's translation:
Although paradoxical, if Gilgamesh, the original Hero, did not possess it, then the later Heroes would not have their Noble Phantasms passed down to them, as they were extensions of Gilgamesh's original legend.
Additional Reiu information:
Kinda late to this whole thing, but just wanted to note that the "owning humanity's stuff" and "having prototypes of all NPs" are actually two separate clauses. One is not the result of the other.
He has the prototypes of all NPs because his legend is what those of other heroes are derived from = he is the original owner of all of their legends (NPs). This is where the "NPs get retroactively added to his possession" part comes from.
The owning all of humanity's stuff part comes from his hoardi―――uh, I mean, adjudicating.