He was shot 5 times, right? And other bullet holes were seen in a fence at his house. If the shooter had only fired one or two shots then it could well have been that he's panicked and shot him. But to fire that many rounds? I don't see it. If you panic you are going to run away, not stand there and fire maybe 10 shots at the guy.

Of course he might have been high and went overboard, but I think this was a designated hit. Who by and why, I wouldn't have a clue, but Barbati was taken out for a reason and I sincerely doubt it was a botched robbery.