[henshinzero]

Agito, Ryuki, Faiz, Blade, Hibiki, Kabuto, Den-O, Kiva & Gaim had more riders than two.

The only riders that had only two riders each are Decade, W, OOO, Fourze & Wizard. If only they had more riders.

Decade: If there was a second rider than Diend. If Diend was a third rider instead... this secondary rider should wield powers like Decade, instead transforms into secondary riders: Gills, Knight, Chalice, Kaixa, Ibuki, Gatack, Zeronos & IXA. Gokaiger -> Decade & Gokaisilver -> secondary rider.

W: If Kirihiko stayed alive, he would've been hiding in the shadows watching over Double. He would've received a Lost Driver from Shroud and became KR Nasca to help Double & Accel.

OOO: There was a lot of Greeed in OOO. Too bad there wasn't a reptile greeed to join the fray. Anyway, if the original OOO returned, he would've been reborn Dark OOO. And he'll seek to accomplish what was almost completed these 800 years.

Fourze: Meteor was the secondary rider, true. But if there was room for a zodiarts kamen rider, he'd be the opposite of Fourze. Fourze wants friends but the zodiarts rider sees the whole world & mankind his enemy. Eventually, Fourze helps the rider a little on balance, friend or foe. Let Meteor be the third rider instead. Those three riders, would've represented Utaoshi Rokuro, Gamou Mitsuaki & Emoto.

Wizard: True again, Beast is the secondary rider. But while Wizard has style rings based on a ruby, sapphire, emerald & topaz. Kizaki's group should have their own mage called Druid, with style rings based on an amethyst, amber, aquamarine & jade. Since Haruto is like Vash the Stampede, Kizaki's mage should be like Nicholas Wolfwood. Beast should be the third rider instead since during his final battle with Fueki, he set Chimera free. So Druid & Wizard are the only mages left.

Well except Mayu, Yuzuru & Yamamoto. Wish their designs weren't all mages.