Here's my theory (and, unlike my other posts in this thread, this post is just speculation): Hernandez got the car in his name since he has the most money and presumably has a good credit card which you need to rent a car. His buddies were using the car and something went down, perhaps a drug deal gone wrong and things escalated to the point where someone was shot. The buddies immediately went to Hernandez, the police arrived, etc. I'm hoping this theory is the correct one because it implies no direct involvement by Hernandez.
I also have an alternate theory that involves the girlfriends.... maybe the victim was guilty of domestic violence, smackin' his girlfriend around..... maybe Hernandez and co. decided to take matters into their own hands and get a little revenge, and things escalated out of control. What was supposed to be a little beatdown ended up in a shooting.... This theory scares the heck out of me because that means Hernandez has direct involvement.
Just throwing those out there - enjoy!