https://www.thewrap.com/green-lanter...ewart-hbo-max/
Green Lantern will feature Sinestro, and two Green Lanterns -- most likely Hal Jordan and John Stewart. It will span several decades and focus on the origin stories of two major Lanterns from Earth.
It wouldn't surprise me if the two GLs are not the expected ones.
I have the same sinking feeling... :-/
Logically, you're correct on both points. But logic often plays no role in Hollywood adaptations of comic book properties. I wouldn't be the least bit surprised if we get Baz & Cruz with some weird amalgamation of their origins with Hal & John's.
They could even make it Kyle and Jessica where Kyle got his ring in the nineties since he's a 90's kinda guy - NIN shirt and all. Or not and the "spanning decades" thing could be a story involving one of their parents or something about when one of them was a kid .... we really have no idea and they have no obligation to stick to comic book lore or what we want or expect.
Maybe Hal and Jessica.
"Spanning decades" also tells me it's Hal and John because they feel like the two GL's who have the most material to adapt across several decades.