It would be hard to really link their deals together because although if guilty both have significant criminal responsibility, Garcia will always be the one who walked up to the car and shot a man twice in the face. His criminal liability is significantly higher.
Watching the testimony of KM's friend, T Kawass asked her why KM and SG broke up and KM kicked him out sometime in 2013. As the friend began to answer, Zangeneh immediate objected vigorously and the judge sustained it so we never heard why. I find that kinda interesting.