Massive amounts of talent go unnoticed. Sure, lots of 5-star guys get drafted... how many are still playing? The backbone of the NFL is built on 2 and 3-star guys.
If Luke Falk is an 'outlier'.. What about USU's Bobby Wagner (2-star) and Kyler Fackrell (USU walk-on), Leshaun Sims (SUU zero star). The list goes on...
Maybe even read up on what JJ Watt has to say about the star ranking system