[OathToOblivion]

Adding to this discussion about Riders keeping powers, Eiji did get the Medals back in Mega Max, but he kept them after that. The thing up in the air on when he did it was bringing Ankh back. His cameo in Ultimatum...yeah, I just assumed he didn't need to transform to handle a couple of mooks.

Regarding Fourze, the Fourze Driver gets destroyed 5 years after Ultimatum, which makes it 2017. Meaning not until the Rider after Ghost has ended. Until then, Fourze's appearances make sense. And even then, Kengo outright said that the Fourze Driver will continue to appear to help Gentaro, even though it seems to be destroyed.

As for the other Neo-Heisei Riders so far, they all still have their power, whether full time (Double, Wizard, Gaim) or for emergencies (Drive).