If the suspect had any intention of continuing with his studies, he would have flown home for the holidays and left the car at school. The only reason to drive the car across the country after one semester is because he no longer needs a car in Pullman, he isn't staying. It seems like he wants to distance himself and the evidence from Pullman.
Maybe he thought he was home free after arriving at his parent's home in PA.
He didn't move his things out of his apartment, but returning the car to his parent's home seems like he's only going back to Pullman to pack up. Instead, police packed up.
Interesting, but why he did not take his computer and his books with him? He could have said he wanted to work during holidays. Although he may took the computer hard drive, but why leaving the computer if he was not planning to return?
I think he wanted the car away, it became a danger for him, a trap. He could not sale it, if he was not its owner, but he could persuade his parents why he needed car to be returned to Pennsylvania. For example, he wanted to buy another car once, he is back to Pullman. The car had to go from Pullman.
But him? Not so sure. He wanted to carry on as if nothing happened. Poker faced. Like now: he was arrested, facing 4 first degree murders convictions and the only thing we have heard so far from him is that the whole thing is misunderstanding.
Bluffing.
LE builds a case as we speak and my guess is there will be few surprises for BK when he finds out what is there for him.
Lets say he wiped the comp and took its HD. I am not sure it would help him completely, the memory could be read regardless.
But the HD no doubt is seized now. What LE will find on it?
And how about his phone? His phone will tell a story on its own. He may left it behind in his apartment on the night of murders, but afterwards he was watching the news, searching for news from Idaho, accessed his SM accounts. When he was arrested, he was feeling safe, he was in no need to wipe the phone's memory.
Did he leave his phone at home when he went somewhere to dispose the knife, the clothes?
Questions, questions. Let's hope LE has all answers.