The theory that lanskey and the fellas set vito up is false, they was able to connect vito to the drug dealer through conspiracy, they knew mutual people and he was in the same company with vito once before eventhough vito never dpoke to him, couppled with the fact that the fellas didnt take care fo him like he thought they would after he got locked up so he flipped, but that lanskey myth is just that

"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."