Yeah, that could work. An idea I've had for a while was kinda the same thing, only with Kyle as that gateway character. It would change up the story a bit, with Kyle being a new recruit rather than the one and only GL. But I think it could work, as could your idea with Jessica. But your other idea with the story starting out with Kyle after the Corps is destroyed could also be really interesting; it could make the whole thing more of a mystery to people unfamiliar with GL and they could discover it along with him. If they go that route though (and they stick to the source material closely) it would mean that the audience's introduction to Hal would be as a villain. Even if they redeem him later on with the whole Parallax thing, as a Hal fan, I don't know that I'd want him introduced that way. Though Rebirth was one of my favorite GL stories of all time so if it's handled that way, it could be great.