Who is Bubba and Claudette Rocque from Heaven's Prisoners and what is their importance?

Bubba and Claudette Rocque are a married couple who run the local organized crime rackets in and around New Iberia. Dave and Bubba grew up together and often fished, played, fought, and boxed with each other in their youths. Bubba knew Dave's father, and Dave knew Bubba's father. Bubba is described as pure muscle and possessed of strength, dexterity, and a violent temper. His grey eyes appear not to focus and his face rarely shows any emotion. Bubba is preoccupied with retaining his youthful physique and boxing prowess and in most respects is what one would expect of a crime boss—greedy, selfish, uneducated, and besotted with loose women and expensive toys.