Well the resume Frost has at Nebraska is based on the past 2 years. Even within this season we did not see him mix things up much, and there is no sign he is going to make an overhaul to his staff or schemes in the coming years.
I also am looking at the long view, and when I assess Chin's 4 years as a D coordinator, there is nothing in his resume that suggests he can lead a stout defense. UCF had to score 50 points to beat their best competition. Frost needs to surround himself with experienced coordinators that know what they are doing which will allow Frost to be the CEO of the team and hone in on minor areas needing attention. Right now Frost is trying to do it all...address the offense, defense and special teams which all struggled mightily. If he chooses to focus mainly on the offense for 2020 then we are left trusting Chin again to fix the defense, and our special teams will continue to be a joke. Had Chin shown success at other schools along the way I would have more faith in him, but I simply do not see it in him.