Is that really what the staff are saying? Because...
A) That's incredibly stupid, even for a show aimed at kids
B) If viewers need to get an explanation from the staff for stuff that happened in the show, you've written and directed your show wrong
You guys explaining that Geiz has the Drive watch. No one would have mentioned it if not for the fact the show pointed it out on screen and was keeping an active count of how many watches Sougo had to collect. If that didn't matter, simply reduce all the numbers by one and don't include Drive.
Maybe they'll explain it later, like this episode sorta did with the Another Riders and current Riders co-existing. But man, watching the Marvel cinematic movies and hearing how the staff are very careful to try to make sure it all fits together and then seeing fumbles like the end of Game of Thrones or Zi-O when it comes to continuity, I dunno. Not everyone is equally skillful I guess in creating a world.