IMO, he wanted to kill "the gang of 4" long time friends/pairs of close friends (all students & friends for a few years or longer who hung out together), whom he targeted specifically, and he didn't care about the other 2 housemates. The other 2 housemates [ETD info about ages, couldn't confirm]... didn't have the same status/closeness as the 4 did socially.
Posted in more detail about this "hypothesis" in a previous thread (as to why all/just the 4 of them could have been his targets).
Known facts:
X & M worked at a restaurant that served vegan cuisine (the Mad Greek in Moscow:
Mad Greek - Menu: their menu says "
Ask your server about our Vegetarian and Vegan options")
BK is a vegan
BK has a history of harassing female waitstaff (the brewery in PA:
Bryan Kohberger harassed women at Pennsylvania brewery: report)
Speculation:
BK could have gone to the Mad Greek on one or more occasion to eat the vegan cuisine they serve
M &/or X were working when he came in and he did it again (sexual harassment of female waitstaff) with one or both of them
One or both of them &/or their manager/shift supervisor confronted him about his behavior &/or told their "besties" (E & K) about it
BK was "triggered" (for lack of a better word) by being called on his behavior & not being allowed to pursue a relationship with one of the attractive females working there
BK started following/stalking X &/or M and saw the 4 of them together after that (X, her boyfriend E, M, her bestfriend K), and came to see them as a "unit" he needed to go after (for whatever his sick reasons were, we may never know or understand)
BK bought a deadly knife with the purpose of doing 1 or all 4 of them harm
JMOO