Paco was the ultimate stone in Miklo + everyone's shoe (**Spoilers)
1. Paco instigated the whole scenario where Miklo smashed Spiders back window. Spider wanted revenge and *beep* up Cruz's back.
2. After carving spider Miklo stops Paco from killing him. Miklo gets shot by spider and instead shoots and kills Spider with Paco's gun. Miklo ends up going to the can.
3. Paco becomes a narc. Paco busts the PCP lab and in turn Clavo's money gets lost. Because of the bust Popeye attempts to payback Clavo by docking 1/3 of all the paroled carnales checks. (**Miklo is one of the paroled carnales.)
4. After they plan the heist without Popeye, Popeye drops the dime. Paco thinks a drug deal is going down at Zody's, instead its a heist. Paco gets into a shootout with Miklo and his crew. Miklo gets stranded, tries to get away, Paco shoots his leg off.
The one part of the movie that I really dislike is when at the end Miklo is talking to Paco and tells him he will always be his brother. If I was Miklo I would've smiled at Paco, after Paco told him that "You used me". Miklo should've answered, "Payback's a bitch". "How could you use your own flesh and blood?" Paco asked.. "The same way you shoot your flesh and blood's *beep* leg off." Personally I think Miklo should've gotten someone to shoot Paco's leg off. Using Paco to take out the rival prison gangs was not a satisfactory revenge in my opinion. But a movie is a movie :)