What did Daiki do with the belts he stole in Faiz's world?.And it's only a little, I know, but with Decade and Diend pretty much shoving the world's Rider into the background as is. If Kuuga showed up in every other world, you would see that world's Rider a little less. The Kuuga question is the most commonly asked and the most obvious.Notice how all the episodes he transforms in (after the Agito arc) are primarily written by the same guy. I think the writer began to realize that he has Kuuga to use instead of just some Butt-Monkey. Then he finally gets to transform and do something useful in the Shinkenger world.

And Kaito stole the real card, originally it was meant to turn Den-O to the Denliner and run Decade through and give him Climax Form armor, said armor splits into all 4 taros beats the crap out of the foe as seen in Ganbaride.Then he finally transforms in Den-O World only to have Momotaros shove a sword up his ass and use him as a morning star.Since Kamen Rider doesn't use Stock Footage it means one less henshin that they have to pay for. I get the feeling that the effects budget on this show is pushing the breaking point as is.Also, the Undead sucker punched him when he tried to transform in Blade World. Decade's belt lets him do it, but Kuuga has no ability to. I'll buy it, but with bile in my throat.Also, since he wasn't chosen to be a Rider it would have probably caused a mistrial.Even if he transformed and went into Mirror World, he isn't exactly a lawyer and probably couldn't do much to help on that front. Additionally, regarding Ryuki's world, he was focused on helping Shinji find the truth in the real world.To which he got told, 'if you want us to help you, you need to pay us.' As for why he doesn't transform into Kuuga more, it's probably so we don't get treating to one of the more popular Riders getting the holy crap kicked out of him every week. He tried to offer his help in the Blade world, but was misunderstood by the BOARD chairman as wanting their help.As for his lack of help in the Blade World, your guess is as good as mine. It's quite likely that he's unable to enter mirrors in the Ryuki World.Why doesn't Yusuke actually help Tsukasa more? He's a Rider, too! In Ryuki World he could've fought for Natsumi as well, and in Blade World he could've helped hunt down Undead.Or it just sort of merges over top of the version of the photography studio in that dimension, much like Tsukasa sort of merges with someone in each dimension.

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