I think the recruiting improved - agree with Chief on that one. I think there was some player development, although there could have been more if Onuorah had sat. Once Gilbert went down they had significantly less talent than last year and so it was a bit of an accomplishment to get a similar record -- performance:talent ratio was better although still not nearly as good as Hurley's. Those are the three major ways you assess a head coach, and all improved versus the prior year. It looked like we weren't going to get many transfers or de-commits if KO had stayed on, so player retention was on track to improve too.
I think KO got help from JC, Blaney, Hobbs, etc his first few years, and demonstrated some significant strengths that complemented theirs. Then he lost the support of those ex-head coaches, and demonstrated a number of deficiencies in his own capabilities. He was slow to learn about his own weaknesses and figure out how to fix them, but he seemed to be making progress over the last year.