What is known is the Eccleston had met 2 or 3 times with Moffat. At that point he declined to participate. Moffat had to have something to tell/show him on what CE would be doing in the episode for CE to base his decision on, whether an outline or a first draft. So.... there probably is an outline and/or first draft of 9-10-11. 9 opted out. Can the story be changed to be 8-10-11? Or does it hinge on somthing like Rose knowing 9 and 10 and 9,10,11 knowing Rose (8 wouldn't know Rose nor would Rose know him).