I doubt Chris was rat. Believe me Chris was a lot fo things a junkie,bad temperment, disorganized. But the one thing you can say is that he never cooperated with the FBI. If you need proof look at the Adriana situation he could have become and rat to be with his girl but he said fuck that and let her die. Also Chris never regretted that decision he just wanted some gratitude which Tony never gave. Everyone says Silvio was the most loyal and Iagree but Chris was definetly up there. Paulie was a blabbermouth who came close to being clipped I still don't know why Tony spared him because he knew that he was talking to New York.