What is actually the difference between an underboss and a capo?
My guess is that a capo gets the order from the consigliere, so that the capo is never fysically with the don, when the don gives an order.
And the underboss can be with the don. So that level 1: Don, and level 2: Underboss and consigliere level 3: Capo
But underboss and capo both have regular soldiers underneath them.

That's my hypothesis. Is it correct?
Oh, and what's right under a soldier, in terms of ranking? A buttonman? A wiseguy?

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See, we can act as smart as we want, but at the end of the day, we still follow a guy who fucks himself with kebab skewers.