It has been said that Tony's favorite scene from the Godfather is the one where Mike comes out from the toilet and kills Sollozzo and McCluskey.

That being said, 1. How would anyone know where the Sopranos were eating dinner that night? It was basically an impromptu decision and 2. Why wouldn't the guy just walk up and do it? He had to go calm his nerves? Come on. Pick up a gun Godfather style? I really doubt it.