Who is the most successful NFL player to have the least successful NCAAF career?

Usually it’s the opposite where the college kid gets all the accolades then flops at the nfl level. The converse rarely leads to teams taking a shot on kids that don’t produce in college.

Some examples being Matt Cassel and Priest Holmes.

Some bad examples:

Tom Brady (mediocre stats, but still decent and some success leading Michigan to bowl wins and conference championships).

Antonio Gates (never played college football but rather basketball ergo no NCAAF career).

Any rugby/foreign player (never played in the NCAA).