OK, so from the affidavit, I note that the police say early on that the murders happened between 4:00 and 4:25 am. However, later on, they note that the Elantra was captured leaving the scene at 4:20 am. I'm going to extrapolate from this that even if DM had called the police, it wouldn't have done any good; I assume that if any of the 4 were still alive, it took 5 minutes or less for them to die, unfortunately. I feel like LE DOES need to spell this out for DM's safety (and mental health) and to get everyone off her back. I know there is probably a 99% chance that nothing she could have done could have saved them but people will fixate on the 1%.
Second, the timeline of the murders confuses me. Does BK have enough time to do 4 murders? You know the defense will be examining this as well. So at approximately 4:04 am, the car appears on camera, drives eastbound, then drives westbound, tries to park, then goes down Queen Road again. Suppose all this takes about 3 minutes. Then you have to allow another 2 minutes for him to park and get to the house and now it's 4:09. Now, at 4:20 am, the car is seen LEAVING again. Again, you have to allow time for BK to get to his car from the house and get back on camera. A murder happens at 4:17, which has to be the last one. We know X is alive at 4:12. X must be the LAST murder by this timeline.
Basically, by this timeline, BK kills 4 people in 10 minutes and must move like lightning in that house. Is that enough time for him to do 4 murders? If I was a defense attorney or giving the presumption of guilt, this is what I'd focus on. Also, how does he get in? Does he have the code to the house? If so, how does he get it? And why doesn't DM hear him come in if X or K do as no matter how he comes in, he has to pass her room to get to both rooms with the murder victims?