They did lose an overwhelming amount of talent last year, including 4 of the top 50 picks in the draft and every play maker on the offense except Kizer.
But that alone doesn't excuse Kelly's inability to construct a defense, which had it's issues even when guys like Nix, Day, Smith and Russell where all on the field. It's become clear Kelly can recruit with anyone but on Saturday he just doesn't know how to make his players better.