This is what a young coach does as they don't have the long tenure as a HC and don't have the connections like other coaches do. Kinne brought in guys he already hired at UIW. Now he has had to go with some help maybe (Trayler, UCF coach, etc...) to find a few positions and he won at WR with someone he knew, hired a co-DC in someone he really knows in McCoil and now went a got a veteran Co-DC to help McCoil. My guess is Peveto will manage run defense and ground game while McCoil can work on pass defense and bring McCoil along slowly.
What did Jake do? Went and hired many TT coaches that his brother likely vouched for, a veteran HC/OC that he fired after year 1, and then took over OC duties. They know a lot of guys as OCs but they are all P5 guys.