UW prospects question - why did their D kinda suck?

Something bothering me about University of Washington prospects. First, let me clarify that I know team results don't always speak for the individual. Even on an awful defense like the Saints were last year, it’s possible to have individuals, play at a Pro Bowl or even All Pro level.

This is more a question than anything.

So in looking at prospect rankings and mock drafts, there are several highly ranked Huskies projected to go in the first or second round:
1. Danny Shelton
2. Shaq Thompson
3. Marcus Peters
4. Hau'oli Kikaha

So why was their defense pretty mediocre?

They were 47th in points against.

Conversely, Clemson which also has several highly rated prospects was one of the top defenses in the country statistically:
1. Vic Beasley
2. Stephone Anthony
3. Grady Jarrett

Again, there are a million reasons this could be possible- high scoring offenses in Pac 10, etc, Peters getting kicked off the team, etc.

Just seems weird to me that a D with so many highly touted prospects underperformed so badly.