[Kurona]

Small theory time: all the Legend Rider stamps we’ve seen so far are Heisei, comprising a total of 9. Not even a Saber or 01 in that hefty number. There is the #1 stamp but that’s part of a special 50th anniversary set that hasn’t been seen in any promotional material for the show (maybe he’ll use it in a TTFC special or something?)

So, basically: what if the different eras are split between different Riders, with our later secondary getting Reiwa and a later third getting Showa? Reiwa has only two riders which fits with secondaries not getting many auxiliary items of their own (it could even be a new type of stamp ala Woz), and with the Showa guy I could see him being like Ghost Grateful where all 15 Showa Riders are in his belt without items. Individual Showa Stamps would of course still be sold through GP and SG and maybe other special promotions like #1’s stamp.

Revi got Heisei because that’s the one with the largest variety of riders that are also easily marketable to kids on their own, hence forming the core toyline; which easily leaves the other two to smaller more self-contained gimmicks that extra belts tend to employ.

This isn’t backed up by anything solid so far of course, but it’s just very notable to me that Revi is exclusively Heisei stamps in the show right now and this seems to me to be how they’d take an anniversary toyline.