This is...a take. I think Gaim is like...Top 5 for me? Blade, Build, Gaim, Agito, Kuuga.
This puts pressure on the show to be good. If there's multiple Riders then even if the show's bad the character interaction and fights can entertain. If you've got 2 or 1 max then if the show's bad it's boring and that's the worst thing a show can be.