My theory about the general focus on K being ’targeted’ goes like this: once LE used the term, and very little else was known, it was understandable that many would look for which of the 4 had your typical ‘mystery story’ motive possibility. AHA! We have a recent breakup, calls to the Ex, and a victim only visiting before leaving for good! Kaylee at first seemed to provide the easiest ‘explanation’ for ‘targeting.’
But now the Ex has been essentially ruled out. So the spurned ex boyfriend motive isn’t working. Now there are many other variants of motives. So many!!!! I just pray that LE has much more substantial evidence to work with!
Personally, I’m intrigued by the killer’s movements: he went upstairs, but not downstairs. To me, that says at least one person upstairs was a target. If Ethan alone was the target, no need to go up there. But if the two girls who worked st the restaurant were targets, yes, he would have reason to go upstairs. Just one possibility.
But I still hold my orginal theory, that someone stopped by, all 4 had a brief nasty run-in with him. And drunk and furious, he came back.