Gotchard's production letter mentioned that, on planning, Legend involvement is 50:50, mainly to promote Rider Chemy.
If he failed to met target then he won't appear on series. He made it, that's why Legendary Legend allowed despite only have two episodes.
This episode is Toei and Bandai test run if Legend works on long run, by promoting Outsiders.
Of course, since Outsiders is TTFC-only (Toei Tokusatsu Fan Club, Toei premium service) instead of part of Gotchard main story, writing QC not went to Gotchard team; risking Kaguya / Legend in process as well.
FYI, audience with access to Outsiders already prepared for the worst when this episode writer announced.
