Watch those SUU boys play and you will know why they got invites and Matthews and Blackmon didn't.
Do not discount the caliber of play at places like SUU. They do not have depth to compete with the BYUs of the world, but they have had multiple players that could start at BYU.
BYU got rid of a QB a few years ago that ended up at SUU and then the NFL. When is the last time you can say a BYU QB played in the NFL???