[AkibaSilver]

Speculation time: Since Decade's aired, we've had a whole 'nother anniversary season for fans to get mad over, a lot of anniversary crossover movies, and generally a bigger focus on past Riders (see all the merch). All this means fans who want to see old Riders come back are satisfied for an itch Decade didn't scratch, and Decade's fans get to see Tsukasa come back every couple of years to take some photos.