I'd be curious to know the organization's scouting practices. Without knowing that, it's hard to say. I really can't imagine Spielman picking more ND players because he's a fan of the program (for example). What schools do they regularly attend? What is their travel budget (does that affect who they're able to scout in person?)? Where are their scouts located (Minneapolis or across the country)?
I'd also need to know if a study has been done that proves that one school is better at "producing" (or recruiting) NFL players (or players at certain positions, as some are thought to do). If so, it makes sense to send scouts to those particular schools to pay more attention to these prospects.
Do other teams have similar school affinities? Meaning, you have 53 guys on your roster; chances are there are several from the same school and the Vikings aren't unique in this regard.
Absent this information, I'd have a hard time speculating. I think it's probably more coincidence than anything else. I mean, if I was Rick every school would be equal and I'd evaluate players based first on their performance/character, and then the system they were playing in and the level of competition. Weighting a particular school (particularly Division 1) higher than another seems a tad illogical (outside of those that are traditionally awful, I suppose). I'm just playing out the question to Rick in my head: "Do you like/favor USC, Notre Dame and Arkansas over other schools?" I just see him smiling and laughing at the question. Of course "Wiley Rick" might be doing that because he doesn't want to give away his secrets: that those three schools are special. If he drafts players from there his kids go there for free. College ain't cheap.
I certainly wouldn't mind Te'o/Woods. They both have potential to be great.