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People still think Lusamine is the main evil boss in Sun and Moon only because we battle Aether (which was rather obvious from the start).
You're forgetting that Ultra Beasts 02 Expansion and Beauty which resemble/imitate Gladion and Lusamine are version exclusives. Nobody knows what UBs are and how they work but there is some clear connection between them and some humans
Because of that and UB02 being exclusive i think Lusamine and Gladion will play bigger roles depends on version and they're still under somoene else.
BW campaign revealed Ghetsis just few days before release
XY didnt reveal Lysandre before release
We might yet to see the true boss
