Dan Simmons blocked me on AOL because I pointed out to him that Paul Dure’s cruciform was removed by the Shrike in Fall of Hyperion so it made no sense to have him resurrected in Endymion.
There was also that bizarro short story that had a time traveler go back to 2002/2004, whenever to tell the protagonist about how all the Moslems destroyed the world. I even started a thread about that, but the link to the original story is broken.