I have rewatched that scene about 5 times. Miguel Felix Gallardo was a great and complex character, and a tough one to pull off by Diego Luna. Gallardo was brilliant and ruthless, but still considered weak and many of the other bosses, even those at the plazas who technically worked for him, barely respected and none of them, or his own people, loved him. It wasn't like one boss was challenging him, they all were, both within the Guadalajara Cartel and outside of it. The Cali Cartel had no respect for him at all. I don't know how much of that was based on fact, but it made the character a lot more relatable and the story more interesting because Gallardo never really seemed to belong at the top.
Even at his most ruthless, Gallardo was reactive and his ruthlessness often didn't have the intended impact. Killing Camarena backfired badly. The political powers had no respect for him at all, and the comparison between loved banditos like Acosta and Don Juan, and Gallardo, whose own wife despised him, could not have been clearer. As messed up as it is, I actually started to almost feel sympathy for him at the end.
Over the 5 seasons, Narcos has done an amazing job creating entirely separate personalities for the main characters, from Pablo's goofy insanity, to the misfit band of guerrillas and rival drug lord lunatics at Los Pepes, to the corporate excess of the Cali Cartel, to Gallardo and now the next generation of the plazas.
The show does a good job of pointing out just how messed up American efforts to stop the supply have been. Walt basically starts the war between Sinaloa and Tijuana by letting Tijuana know that Sinaloa is avoiding the tax instead of arresting the Sinaloans. He gets hundreds of people killed by that decision. I don't know if some DEA agent made that exactly decision, but there is no question that America has provoked the Mexican Drug War.
Season 3 of Narcos Mexico is going to be awesome. Tijuana vs. Sinaloa vs. Juarez vs. the Gulf.