From item #9 in the affidavit:
"On 6/26/2006, SOI2 was interviewed and explained that on the EVENING of 3/11/06, Green and KP1 talked about raping the woman" snip...."Subsequent to the conversation discussing raping the woman, SOI2, SOI3, KP1 and Green went to the home...."
Not hypothesizing it was night, they affidavit says it was.
The afidavit has some issues.
So what do we know about the revenge killings? Who got killed? Where were they on the night in question? To the terrorists have good G2. Did they know who was really involved and get two of them? Or did they just know the right unit an hit that? Something at this scene broke the story. The military started digging. The other culprits come up with a plan to pin it on someone else and try to save their own necks from a revenge killing. (This is pretty weak speculation).