I'm not sure about d'arco....there was very little about him before the book as far as I could see...which makes me think he was a bit sharper than most we talk about-theres not much threads on here about him...

In the book, he doesnt spend too much time on gravano (from what I remember), and got pissed with casso big time, like gravano/gotti when the guy turned on him. Yes, there are similarities to say the least, but thats maybe the common straw that break the camels back, so to speak.....