People keep asking how they're supposed to have the time to introduce other riders and other things. Here's a special thought. They do it by not wasting our time. You do the story, do the character development, and don't waste our time on wacky hijinks that neither develop the plot or advance the character story. There are only 9 rider worlds. If we do three worlds per rider, that leaves us three extra episodes for a finale. Realistically, if they run the second rider (and we only really need one rider, the second rider is unnecessary since we're getting to go to 9 rider worlds, you spoiled people) concurrent to one of the other world arcs or he finished a world early, then the second rider would fit right on in there. The big trick is that they keep the main cast small and stop wasting our time on side arcs and cast members who aren't going anywhere.