40 th Masked Rider
Takaiwa and Eitoku were there directing the other suit actors, it looks like they're not participating in the action themselves.
Not entirely surprising at this development. They've been two of the main "go-to" suit actors for Heisei riders, and as such, are starting to get up there in age. They won't be able to continue doing this forever, so it's good that they're taking a hands-on approach to teaching the next generation of suit actors.
EDIT: Just realized that there are only 2 eps of Goseiger left. Only 2 more eps of EriMoune.
Oh...and something else I've noticed over the last few eps.
Alata's haircut looked somewhat familiar to me...then it hit me.