Hal was brought back with the promise that all GL's would still get equal focus. In the beginning they did, Guy and Kyle even became co-leads in GLC. The main problem was that as each event passed, it became more and more of a Hal Jordan show. To the point where all the legacies were basically sidelined to keep Hal as the 'main' GL guy. There was a clearly hierarchy now.

You can't blame COIE or Emerald Twilight for that since as you yourself admitted, the Post COIE world did have a period where all the legacies could co-exist in harmony and the people who wrote those aforementioned stories were no longer in the drivers seat.