This is called confirmation bias. We have no way of knowing what effect, if any, the coaching changes had on our play this year or to what extent any effect was caused by poor coaching rather than due to just having new coaches. For all we know, we'd have done even worse with the 2 coaches we might have had if Kevin Krueger and Hartman weren't added to the staff.
There is no evidence to support your underlying assumption that, because he was only at Northern Arizona and not at a basketball powerhouse like KU or UH, he's not a good coach.