User blog comment:Rassilon of Old/New Young Justice in March/@comment-3337007-20120129195609/@comment-1038387-20120129202644

Green Lanterns don't have sidekicks (traditionally, but this is Earth-16...), though in modern continuity, they work with two Lanterns per sector. Since we already have three GLs, it's a bit crowded and requires either full explanation or complete ignoring. IIRC, Greg said the GLs are not going to get much screentime, so I think it's the latter.

As for Kyle Rayner being younger... The Corps does not seem to have age restrictions, seeing as pixie cheerleader Arisia was underage when she joined.

But why should Kyle appear? What could he possibly add to the storylines?