All of those examples were walk ons... Valle has had plenty of kids that COULD play at the D1 level (Tyler Hunt style). I get the point you're making, and don't completely disagree, but I think you're slightly underselling the type of players Valle has had.
I think the biggest difference is on the line of scrimmage. I played offensive line in the MIAA and i have watched MANY offensive lineman from Valle that had the talent to play D2, but with the way recruiting works now, weren't tall enough to get a scholarship out of High School.