It all makes sense?
By the way, concerning the poor use of Hal Jordan and him going nuts on the GLC and becoming Parallax... I've just recently learned that there may be an explanation.
Hal Jordan wasn't wearing his own ring by the time Emerald Twilight rolled around... he was wearing Lord Malvolio's.
I just came across
this page during some idle web-surfing. Though clearly the actual writing of the Emerald Twilight arc was shoddy, ill-conceived, and just... generally below contempt... if DC ever took some time to think about it, they could do some retroactive explaining.
According to the above "Malvolio FAQ", in some story in the 70s, the evil Lord Malvolio had used his own semi-GL power ring (stolen from his GL father but apparently powered by his own force of will -- he
believed that it would work for him and
believed it to be greater than other power rings). He used this ring to destroy Hal's, and when Hal later defeated Malvolio, he took Malvolio's ring to replace his own. According to that story's author, that was Malvolio's plan all along -- he had planned to use it to follow Hal back to Earth by tracking his ring there, but this was never made explicit in the comics. Apparently, the writers and editors of the GL comics totally forgot about this fact, and Lord Malvolio hasn't been seen since.
It was suggested (again by the story's author, Malvolio's creator) that most GL rings are wired by the Guardians to shield their bearer's psyche, to prevent them from going mad with power or losing control when their power failed them. As the power of Malvolio's belief in himself powered his father's ring and his lack of knowledge of its weakness made it possible for him to affect yellow, perhaps those flaws acquired by the ring through its contact with Malvolio rubbed off on Hal Jordan. Perhaps he went on his rampage because his ring was the only one that couldn't suppress his ego and id, causing him to go nuts with power and kill off all the other GLs -- something that he would not have done had he still been wearing his original ring.
Though the writers seem to have forgotten the fact, Hal Jordan/Parallax wore Lord Malvolio's power ring right up until he bit the dust. If they did remember, they just might have an explanation (if not a justification) for Emerald Twilight, no?
Hope that all made sense... I'm just a little tired and kinda... addle-headed?