I was just going by the movie.He was way more fundamental in the book. In fact there was supposed to be a movie about him and Sonny Corleone but it never came into development.
After my original post I looked up the character biography and

I was just going by the movie.He was way more fundamental in the book. In fact there was supposed to be a movie about him and Sonny Corleone but it never came into development.
There were at least two instances where Silvio kind of betrayed Tony.
1. He felt a way about Tony making Christopher his #2 guy in season 4, and was actively undermining the Esplanade deal (gave Patsy the OK to continue stealing from the site).
2. When Tony got popped Silvio and Paulie weren't giving Carmella any money. They only showed up with bags when Tony's condition improved again. They smiled in her face but Carmella caught them scowling when she turned her back to them (can't remember if it was in a reflection or something).
I feel like there's a third betrayal that I'm forgetting about.
That was Vito and Paulie...but you're right about your first point.
James Wesley
Ronnie Gardocki from the Shield
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the Japanese guy from American Me...