Gustavo's revenge on Don Eladio in Breaking-Bad must have meant more than just personal satisfaction for Gustavo. Was Don Eladio running the entire cartel or who was he in general? I assume if he wasn't the main guy, Gustavo would not be able to live a normal life after taking out a high rank cartel member.
Yes, Don Eladio Vuente is the head of the Ciudad Juárez Cartel. His title of Don says it all, implying royalty. But Gus' revenge was mainly personal, as Eladio was the one that had his friend killed right in front of him a long time ago. It was just very very thorough because if it wasn't, any living members of the cartel would have sought revenge.