As a person that has managed sales people for years I see it all the time.

When people are making quota they tend to be less motivated to do the little things to be more successful. In Kalani's case he took over the d and was more involved in day to day. He had multiple people involved with play calling.

Once the security he was there and a winning pattern was established he backed off again and just let people who were already failing go back to leading to failure again.