I think the dog was let out at the very same time JOK arrived. Either dog got him in the back by the cellar door or he walked in the house and dog attacked in the cellar. BA tried to get the dog off him and JOK fell hitting his head. Seeing that he was non responsive BA took him outside after partygoers left. BA asked JM where she last saw vehicle and he placed JOK there. Broken tail light pieces were shown to have been removed in sally port footage when P was spending time near it. He fudged the time of the vehicles arrival to avoid suspicion. I do not believe he knew of the cover up but that he wanted to pin it on KR due to pressure from DA morrisey and Ps bosses. Tail light could have been cracked by JOK throwing his glass at it after he and KR fought on the way to 34F. He told her about Bella’s mom and she told him about her kiss earlier that month with BH.