If what you say is true, then perhaps this event will be brought on by Gigi. it seems to make sense to me. Consider that Gigi himself doesn't really 'fit' in Eorzea, yes he fits completely for final fantasy and such..but he doesn't look like an Eorzean. If he were to have carried with him this 'watch' and considering he lost his memory stumbles upon summoning the yo-kai by accident, it could be fit into the game in that sort of way. Godbert being the master goldsmith he is, could ultimately be the one who 'fashions' the yokai into weapons. Perhaps we consult Gerolt on a way to 'capture' them similar to the ARR Zodiac questline. They are simply spirits after all. A neat idea if they work it in that way.