It is hard to understand how Kelly can have teams perform so differently over a short period of time. Injuries and better opposition account for some of 2014, but not all of it.
If ND gets healthy and players don't transfer and stay eligible, 2015 could be a great year.
Still, losing 9 games in his 4th and 5th seasons is a huge black eye for an ND coach. The fact that the teams were not deep enough to overcome injuries and suspensions shows that Kelly is not recruiting well enough and not retaining enough players or developing players.
This isn't the NFL. There are not general managers to blame for not drafting well. He gets the players and develops them and puts them in the positions that he wants. It is all on Kelly.