Buck knows where all the scumbaggery is festering and Hank looks up to him like a hero. I remember that episode where Hank told him he loved him in front of Cotton and Cotton starts roasting Hank every chance he gets.
COTTON: You hate me, do you? After all the love I allowed your mother to give you!
My boy Thatherton is basically a younger and smarter version of Buck and Hank stays hating.
Hank played himself in that episode by trying to get that account for Strickland Propane.