There’s nothing suspicious about someone being a grad student. The theory that I saw here, (if I remember rightly,) was that it was someone who wasn’t in school, but was clinging on to student life, anyway.
MOO
Yep, I didn't think he'd still be in school. I figured he'd be a grad student who might be "in and out" of his unit-bearing program (but BK was registered at a different school during Fall and had registered for Spring). My point was that he was "interstitial" or "liminal" to U of I - and I was right about that. I was also picking that age group (grad student age group/passing as grad student) because that's where my own theories led me.
And, I didn't want to accuse all grad students, anywhere. I still think we'll find that he was on the campus of U of I several times and my theory that he was not a student there is correct. I wonder if he was able, in any form, to meet U of I students. While my theory included the idea that he might be living surreptitiously on campus of U of I (totally wrong there), I also theorized that he would be using the U of I library, its computers, perhaps sports facilities, etc., in an effort to hang out with younger students. I also theorized that he'd attempt to use his status as an older student to influence/get to know younger students in some way (hang out at their parties, talk to them at the gym, go to the bars in town). And I theorized that he would eventually be shown to have committed other, more minor crimes (but that he has no criminal record).
IOW, he was a lurker at U of I. And at WSU, he was probably engaged in lots of thinking about his future crime - but he chose to do it away from his primary place of residents. Frankly, he made enough mistakes that I think he wasn't quite paying attention to his criminology classes (although, as far as we know, his undergrad degree was in something else, maybe psychology).
AFAIK, DeSales has no program in criminology and his advisors there were in the department psychology.
IMO.