[quote=@PKMNB0Y]
[@VitaVitaAR]: Oh, so that's how it works? Okay.
Uh.
Hrm.
So, wait, each can transform into their own individual Rider, though, right? Or can they not?
[/quote]

Kind of? They can transform into Kamen Rider Cyclone or Joker on their own, using a different belt...but even if that's included in their equipment, they can't both transform into those forms at the same time because there's only one of those belts by the end of the series. And if I'm not mistaken, there's not really much of a reason to, since it'd be weaker than Double. Basically...it seems like if anything, it'd be a "one of them is unconscious/captured/otherwise not available" last resort thing.