This question was addressed in the book, as it relates to why Ruggiero would have given the contract to a low ranking amateur, like Hydell.

As per Gas, he believed that if his murder was successful, then Ruggiero would have had Hydell whacked. Imo, I'm not sure I buy that since Danny Marino was Hydell's uncle and likely would have tried to protect him.

Edit: I believe Beanshooter meant to say Ruggiero, not Gaspipe, and my response was based on that assumption.