I have to disagree with you about Kruger. he set the edge, quite possibly, better than any other player we have had on the team since 1999. He was effective playing at all levels of the defense, from rushing the passer, to playing the run, to covering short zones in the passing game.
A lot of people look at his sack numbers, and assume that he really fell off, because he went from 11 sacks in 2014 to just 2.5 in 2015. However, he was used very differently in those 2 seasons. I don't think that O'Neill was effective in using his OLB at all. I think that he had them in confused roles, and never really used their strengths to their best advantage. It's a big part of the reason why we let Sheard go.