Well, at the risk of answering critics who are too far afield to really worry about, the fact is that I have plotted the Laramie Saga as one in which Ennis learns to move on. I have had a LOT of feedback from readers about how painful and tear-inducing the Jack flashbacks are, and I was extremely leery of including any police-level detail concerning the murder of Jack that would heighten the pain for readers.
In the first two books there were a lot of flashbacks and references, and in the third book, Ellery had his own ghosts of the past come up, putting him and Ennis on a more even ground regarding the power of the past. But the third book takes in a rather compressed time period ,and the fourth book has so far taken place (up to the wedding weekend) in less than two weeks. The next book is going to become more introspective, now that Ennis and Ellery's relationship is underway, and return to themes that were brought up in "Looking for Answers" about Ennis's unresolved guilt, Ellery's feelings of inadequacy in "measuring up" to the intensity of the love Ennis felt for Jack, the magical hold of Brokeback over Ennis, particulary over his erotic feelings.
But ultimately, Monica is right: this thread is about Ennis and Ellery. The whole rest of the discussion board is about Ennis and Jack, and they don't know Ellery from a hole in the ground - and he is a worthwhile character in his own right, having brought some elements of experience to Ennis's life that are new and exciting for him, and (hopefully) for readers.
That having been said - I don't have any issue in discussing Jack in the context of the story, and it is certainly not discouraged here!