After reading the post article my mind has changed, the hit was to well planned and this kid has balls the size of Texas, it might be more to this story...maybe the message on his hand was a sign to his conspirators that he won't snitch

"McGurn likes you, so I make you. So you are now one of us, if you fuck up, we take it out on McGurn. He is your sponsor. Fuck up, it's his ass. You work in his crew, he is your capo."