Ok, I see what you're saying
I feel the reason the John Stewart character is where he's at today is because of luck. Snyder wanted John in the story, so he's in there. The editors didn't request this.
Hal, Simon, and Jessica are good examples of editors solicit pitches specifically for those characters. That's where John lacks at right now. And that's what he needs. Sure, there are some pitches where a writer get to choose what he/she wants to write from editors(Green Lantern:Earth One is a good example), but that seems more like the chosen GL has won the lottery. John needs more than luck to get some attention.