Rumor has been either debunked or just an exaggeration. Apparently Masahiro Inoue, Tsukasa Kadoya/Kamen Rider Decade, snuck onto the Kamen Rider Drive film set. It’s not a great translation but it went a little something like this:

[I ran into the next yearly Rider series being filmed and decided to sneak in. When some staff members recognized me they yelled “Here comes the Destroyer of Worlds!!”]

Stop crushing my dreams, man. :cry

You delusional man. :lol

Stop ruining my day, OOOBoy.

Thank you! The character might be someone I dont care for, but man does his actor love his role :lol

This story should be true, as Masahiro Inoue did post this on his Twitter account. Doesn't mean he has anything to do with the filming of either Drive or Gaim or something though.

From my limited knowledge and the online dictionary, the story was told more simply.
Apparently he came from another shooting and happened to pass by the current set of a show featuring a masked hero (which is probably Drive in this case?) and decided to check (the japanese sentence ist basically that he came up with something, so he probably went up to them quoting his catchphrase or something? ;) ). The staff members that had also been working on Decade before greated him with "The destroyer is here!"

Sounds more like curiosity than a role to me?

I meant the Rumor of him being there for filming a scene for Drive was debunked by him confirming he was just nearby the filming set :lol

Yeah, if he would be filming, he would have left some kind of hint, as he usually is really excited about being in Kamen Rider.

Just love the production crews reaction to seeing him there though :lol. "It's the destroyer of worlds!" :lol. Bet if they weren't on the job they'd be hamming it up and so would he :lol

Wow, even the production crew can't stop calling him the destroyer of world's in everyday life lol.