Brian Kelly came into a situation at ND that most people dream about. When he got here, he realized it was a nightmare. The players that were left were all good and possibly great players coming out of High School. After a few years under the Weis regime, they became adequate to poor players.
Darius Fleming came to ND as a highly recruited SLB with great upside. He spent his first two seasons at Notre Dame as a somewhat undersized defensive end who occasionally was used at linebacker. He was most comfortable with his hand on the ground, at the End position.
Kelly came in and saw a player that with a little coaching could become a key individual of his Defensive schemes.
Fleming Grew up this past season and the guy had to overcome 2 years of bad/NO coaching to get where he is. One more year and who knows where he will be.