It's hard to say because you have to look for guys who didn't find success at the school they ended up at.. often-times it's a matter of finding a guy who just got buried in the depth chart---not necessarily because they weren't good, but because there were so many other talented players that they never had a chance.
So, with that in mind---and I'm guessing here, I'd say Brandon Harrison could end up fitting the bill.
But then there are guys at ND who could have done better at a different school. There are two such examples between Jimmy Clausen, Demetrius Jones, and Zach Frazer.. you can't expect all three to start.