Yeah, Kyle Rayner was totally a supporting character in the Green Lantern books while he was the only Green Lantern for ten years.
Ah, the "Loser era." It's probably wrong to call Rayner a supporting character in that regard, since he couldn't support the sales of the title. Like most folks, I rarely picked up GL
during that time unless an issue featured Hal or some variation of the Corps - something that the publishers were well aware of and which was the corporate motivation for those stories.
But I'm sure the studio will get right on that. "This movie didn't make as much money as we'd like, so let's reboot it with a character who couldn't even sell comic books."