One theory that makes sense to me as far as all 3 being killed would be if all 3 were aware of say one of them buying some drugs and all 3 were aware of WHO the drugs were coming from. Say Gianni was making the buy but the other 2 knew about it. Well if they decided to say rob and kill or try some ransom deal with Gianni then the other 2 would tell all. They would tell the cops exactly who Gianni was making the deal with and send the cops right to the suspects door persay. So they had to kill them all. Just a theory but it makes sense to me.
This is one of the very best theories in the thread, IMO.
You dont loan 5k to someone you dont trust.
That's one reason why I think it could be a close friend. I know it sounds counterintuitive to think a good friend could be the killer, but that's the person most likely to have his guard down to be taken advantage of. I think the loan was at least 5k, and there was 0% interest on the loan, but the lender just wanted it paid back at some point. If it took a year, fine. If it took ten years, ok. But I think he had gone months without seeing a penny while seeing these guys blow money on BS. And the thing is, when people owe money between friends, a deadbeat borrower never says, "I'm a deadbeat. I have no morals, no scruples." That never happens. There's something psychological that makes them project it onto the lender and actually believe it, as some sort of coping mechanism that helps them to justify being a deadbeat. "
You're a jerk.
You're (insert insult here)." And so on. Look at how many foreclosures have happened in the USA since 2008. Nobody ever says, "I was greedy to borrow so much money. I was stupid. I have only myself to blame." No. It's always someone else's fault. "Greedy f--king Jews" and so on. You hear it all the time, or at least I do. If they verbally abused the lender to his face and the girl chuckled at the insult, that could've been how she got mixed into all of this.
Another possibility:
Whether it's drugs or just straight up money, I wouldn't be surprised if the pair was killed first and the killer took a photo or two so he could torment Gianni with it. I can easily imagine the killer showing Gianni photos and saying, "I pulled the trigger, but YOU did this. They died because of YOU. All you had to do was pay 6530 dollars and 52 cents, but your brother and your girlfriend are dead because you're a jerk and their lives weren't worth 6530 dollars and 52 f-ing cents even to you, and these pictures prove it." I'm guessing Gianni got smacked around for a while before being murdered. Geez, it's untelling and scary to think about, considering how it seems like they can't even determine the cause of death.
One thing that makes me think it wasn't an experienced killer and certainly not a career hitman is the fact that the two victims at the mall survived as long as they did. The girl made a phone call and the guy died in the hospital, not in the car. I think this is the first time the killer had killed anyone.