[MrWilliamGraham]

Some fascinating tidbits on the Sentai Figuarts from members of Bandai:

Terano: Since I was originally in the Collector's Division, I was able to experience the process of suspending the development of the squadron series at SHFiguarts (laughs). There were circumstances such as "difficult to expand overseas" and "the squadron wants to line up not only Red but also other members". If it is a Kamen Rider, it is possible to commercialize only the leading rider, but the Super Sentai is not limited to Red. What's more, when the design changes due to power-ups, most parts need to be remade, unlike suits for shooting. Then, the development hurdle became high, and the commercialization of SHFiguarts went away.

There was interest to revive the line as far back as Ryusoulger and Kiramaiger, but the developer realized Zenkaizer could encapsulate the whole team

Another member confirms they did consider adding the fan, but it could not be worked out in the final development schedule. The response of Zenkaiser and Momo has been great enough that they are considering doing other non-red releases

Source: https://hobby.dengeki.com/reviews/1555730/