[TheRaizin]

So, then, is the question what instances do we prefer for characters to use the term rider?

I'm always stupid giddy when someone goes "That's what a Kamen Rider is/we're Kamen Riders!". I feel like a child when someone does that lol. I liked the first bits where Fuwa, Jin and Aruto reaffirm to each other why their Kamen Riders. In basic sense, everyone has their own understanding of what Kamen Rider is to them. Gai sees them as weapons, Jin sees them as liberators, etc.

I don't like the end part where Aruto "After all, we're Kamen Riders, aren't we?" Because, as you say, only the audience knows what the dialogue means. It means different to both Horobi and Aruto in that instance. Although, I did still feel giddy when he said that lol. It's a kino phrase.

I think my favorite of using the term Kamen Rider is when it's used to specify a specific figure/s. This guy is Kamen Rider Kuuga. These are the grongi.

It gives off this legendary status to the rider and separates him from what he fights off or those that he fights alongside with. He is the Kamen Rider.

I think, maybe, somehow, Revice is doing this in some way. Since all the riders happened, it can be assumed that the term "Kamen Rider" is a way to assume a specific figure in a point of time that saved the world or a specific area. An urban legend, just like Fourze. George basically attempting to create his own little rider group, his OCs if you will. Instead of having it so "Kamen Rider" pertains to a specific idea, it pertains to specific figures in history.