Who was the biggest undergraduate bust in the NFL as the #1 pick?

UNDERCLASSMEN AND THE DRAFT
Since 1990, 15 of the No. 1 overall picks have been underclassmen.

Jeff George – 1990,
Steve Emtman – 1992
Drew Bledsoe – 1993
Dan Wilkinson – 1994
Ki-Jana Carter – 1995
Orlando Pace – 1997
Tim Couch – 1999
Michael Vick – 2001
Mario Williams – 2006
JaMarcus Russell – 2007
Matthew Stafford – 2009
Sam Bradford – 2010
Cam Newton – 2011
Andrew Luck – 2012
Jadeveon Clowney – 2014

Which undergraduate was the biggest bust as an overall #1 pick?
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