Spot onI've seen that too, and I didn't get that from reading the AA. I think it leads us to believe one of KG/MM were the targets (perhaps even both) but I don't think the AA clearly gives us evidence MM was target.
My opinion of sequence of events:
4am~ doordash for Xana
4:04am he is seen parking. Leads me to believe earliest he is in the house is closer to 4:05/06am.
He heads upstairs first.
When DM is awoken "around 4" thinking she hears Kaylee playing with dogs - it's actually the attack/murders of MM/KG happening.
BK heads down stairs somewhere around or after 4:12am (probably closer to 4:17) since we know Xana was still using TikTok up until this time.
IMO Xana was up and heard something which makes her leave her room or perhaps was even just going back and forth to the kitchen to discard her doordash trash.
She sees/hears BK coming down the stairs and this is when DM hears someone say "there's someone here"
I think BK felt he had to kill her now.
I think the biggest question mark for me is the killing of X/E. Im beginning to think Ethan was probably asleep during most of this.
BK sees Xana goes to attack her and she bolts back towards the room (hence the AA making it seem like her body was more likely in the door frame or right at entrance).
In the midst of that attack Ethan wakes up and the killer obviously focuses his attention on Ethan. Kills Ethan, but Xana is still alive "whimpering/crying"
This is when BK says "don't worry I'll help you" that DM hears. I think he probably "finished her off" at this point. (As gross as that was to type).
The murders/attack of X/E happen at the 4:17am mark of when the neighbors cameras pick up the noise closest to Xana's room.
Also the direction the killer comes from in order to be able to "walk past" DM is obviously more so from the direction of Xanas room and not the upstairs.
Then at 4:20 car is seen leaving.
Nothing in the AA shows me or hints to me who exactly between M/K were targets. But I'd be interested to hear actual opinions/evidence that lead people to believe MM target.