Since it was an ordinary event for students to go back and forth among various parties, with nearby Sigma Chi being a typical example - and there are 3 other similar houses nearby - I think the simplest explanation is that BK simply went and looked for parties at U of ID, where he would be a stranger and an older (from his POV) impressive grad student, and followed people from party to party. There are 2500 members of Greek life at U of ID, over a period of a few months, he would have seen quite a few of them more than once, narrowed down his focus, and then started sussing out whose living situation was most vulnerable.
JMO. Speculating.
True enough. And now that it's possible that he went south down toward Ouray, CO, makes even more sense (driving on a snow-cleared interstate is a bit different, but you're right, just going to get gas, etc, ends up with layers of ice and gunk in that kind of weather - I always forget that, as where I live, precipitation does not come down in the form of sleet or snow and instead, washes our cars for us.
In any case, no way that he was able to clean the interior well enough to destroy all blood evidence/DNA. Although he might have been prepared with plastic bags, it appears he did not wear booties. So I doubt he put booties on in his car - but maybe. Maybe he had a seat cover and then removed it. I hope, if so, they find a record of him ordering said seat cover not too long before the murders. He does appear to have been very concerned with planning around blood splash and transfer.
just my opinion, don't come for me.
