I have heard the following sentence in the Narcos TV series:
Quiero que les quede bien clarito que lo único que deja serle fiel a Pablo es una bala en la cabeza.
Context: a drug dealer which used to belong to the Medellin cartel is asking her partner to tell the leaders of the cartel sub-gangs that Pablo is not reliable.
I don't clearly understand the expression "que lo único que deja serle fiel a Pablo es una bala en la cabeza". "lo único" who? What does "dejar serle fiel" mean in this context?
If I try to translate the sentence to English, I get
I want to make very clear to them that the only thing that allows Pablo to be faithful is a bullet to the head.
However, that doesn't seem right, because from the context, I think that the sentence is not about Pablo Escobar, but about the people that are faithful to him and end up getting shot by him.