Wataru's speech from Movie Wars basically summed up how Decade's writing staff approached this series.........THEY DIDN'T MAKE A DAMN STORY.
That's basically my only gripe with Decade (besides making Kiva World look like ****), the writing staff clearly had no idea what the **** they wanted and it seemed every individual writer wrote random **** for their own damn selves.
It seemed like each writer that wrote for this "fanservice series" didn't try to make any effort in some way to work with each other to add consistency throughout the series to make it appear like they were trying to build a story for this "anniversary series."
But they didn't, and the end result was basically.....Aikawa wrote his episodes based on HIS INTERPRETATION OF DECADE, Kobayashi wrote her episodes based on HER INTERPRETATION OF DECADE (and more Den-O spam), Inoue wrote his episodes based on HIS INTERPRETATION OF DECADE, and Yonemura did the same as everyone else.....but worse.
Neither writer in the Decade writing staff appeared to not wanna work with each other, so we just got a messy plot as well as a messy execution of a messy plot.
Even a series that was JUST STRAIGHT FANSERVICE, it would have had a better "execution" of a messy plot than this one.
A concept of an all-powerful, ominpresent Rider like Decade was ruined because of an inconsistent writing staff with even some additional blame to the rest of the production crew as well.