All MOO, because the factual things have been linked a million times already and I'm lazy:
1. No, the calls made by K&M were not urgent - they were spread out over half an hour, not 2 minutes. No calls to 991. Family says she often called several times until you picked up.
2. Target - honestly, it might have been any of them, as the information we have is so limited and so conflicting. The locations make me more sus about 3rd floor victims, the timeline about the 2nd floor victims. And a lot connects M&X. Yet, dad hints at K. I personally also still think there was an obvious reason why the PD came out with the target talk right at the start (other than calming people), like one of the kids having a different and graphic outcome, such as being decapitated, mutilated or posed.
3. K&M were super similar - I just don't see that. While some people have stated that, to me, that's a hard no. Sure, they both had bleached blonde hair colour and they both had a very noticeable tan, but that's all. The height, weight, hair shape and facial features are not even remotely similar to me. Anyone who had any an idea who they're going to kill would not mistake one for the other, not even in a dark room when they're fast asleep.
4. Gaps on X&E timeline - being the captain obvious here, but they are a couple. That has been partying that night. It is possible, that some part of that gap is just them being alone to chat about the day, have sex, or get some peace and quiet. I have the impression from social media (inc the tiktok impressions of roommates) that X was somewhat more responsible and a small-crowd person than some others in the house. At the same time, it is very possible that these gaps hide something important, too.
5. Current impression: I still think it was emotional, it was someone at least one of them knew, and it was somewhat planned, but probably not carefully planned. For all we know, any of them might have an ex who kept building up anger for years without them being any the wiser. People can keep that sort of anger for decades, so a pre-college relationship going awry is not impossible. Similarly, the stalker angle and someone being pissed for any reason make sense to me. I don't really see it as a thrill kill and I don't think this sort of a thing would be very likely for a thrill killers first attack - too risky, they'd have more time to plan etc.