I think narratively SHTGP is probably the best movie out of all these All Rider Spring movies. The only big problem, aside from sticking to the usual format (Shocker, Rider vs Rider, Suit-only Riders that are just background) is the Ninninger in the final battle. Outside of that, for once, they actually foreshadow the twist from the beginning of the movie, rather than outright lying to the viewer with many pointless scenes. It
is pretty much a remake of Let's Go Kamen Riders though.
One of the issues is that in fanservice it's a step back from Rider Taisen. Unlike in that movie, all returning Riders here are mostly supporting players and don't carry their own plotlines. Also, only Zeronos really gets a lot of screentime. Some suit-only Riders are completely shafted, don't even get real battle scenes and are even cut from the final battle, due to plot reasons (X, Amazon, Skyrider, ZX, Shin, ZO, Kuuga, Agito, Hibiki, Den-O, W, Fourze), while KRT made sure everyone used at least one finisher throughout the movie, many even more. Some of those at least still some some unique things, but, aside from W and his Revolgarry during the race, it's blink and you miss it scenes (X releases energy X's during Drive's final transformation, ZX using his cross shuriken, Fourze flying around with his rocket).
Curiously, I think they had lower budget for this final battle. Maybe due to the Grand Prix, or just because they knew the movie would perform worse than last year's, considering the lower profile choice of returning actors and lower box office of recent Rider movies in general. They don't even have enough suit actors to feature all Riders on screen together. While all Riders were together, they were always split into three shots. Even after some leave the final battle, they still don't ever show all remaining Riders in a single shot.
The yearly attempts at making stories that would get all these Riders to fight each other are getting old; I do appreciate bringing back old Riders, but the writers obviously don't know much about them or their shows, otherwise they wouldn't do nonsensical things like having Yuuto be without Deneb for 90% of the screentime he has on the movie.
Yonemura actually was a writer for 4 Den-O episodes and one movie. I don't think any of them had Zeronos though. Anyway, one of the main problems with these spring movies is that they stick very rigidly to a stupid formula. Every single one of these movie seems to have to feature Shocker and Rider vs Rider (or hero vs hero for the first two SHTs). They're all by the same producer and writer - and especially the producer is likely the reason for this plot to be repeated over and over.
Anyway, it's always Rider focused because these movies have a Rider writer and producer, so they obviously are going to be Rider movies, or at best Rider/Sentai crossovers. It wouldn't make sense to take this staff and make a Sentai focused movie. Sentai Vs movies also have much lower box office than Rider movies in general, which likely doesn't help the creation of one extra Sentai movie.
