I thought he was really gonna step up as a major player when he got the new hand, too. It seemed like Aquaman kept getting omitted from the JLA because no one really knew what to do with him other than Morrison, who made him the unforgiving, cold-hearted badass of the group to great effect. Other writers just didn't really feel comfortable with his having a character-based niche, I guess, since everyone else has an ability-based niche to go along with it: Superman's the powerhouse, Batman's the thinker, Wonder Woman's the warrior/diplomat, Martian Mahunter's the telepath, Flash is the speedster, and GL is the all-around supporter. Before the new hand, Aquaman was just a weaker amalgam of others: strong but not as strong as Superman, cunning but not as cunning as Batman, telepathic but more limited than J'onn, fast but not as fast as the Flash, a diplomat but more hot-tempered than Wonder Woman, and not much use as support unless they're near water. The hand opened up a whole new world of possibilities in the context of the JLA for him. Now, instead of bringing on some third-stringer like Zatanna, the JLA could have a hugely potent magic user/nullifier built right into the Big Seven. I never understood why no one seized on that. Even now, in the JLAC arc that features the Big Seven, there's been basically no use of the magic hand for anything, even though it's a wildly versatile asset. It just bugs me that everyone's letting that potential go to waste.