Is he the first American LCN member, technically?
I see that he was born in 1867 and I am unable to find anyone who came onto US soil that was born before him.
Or does more credit go to the Terranova brothers?
Costello was also technically born 2-3 years after the Terranovas but didn't come to the US until 1895.

I do know that LCN originated from a multitude of youth gangs but I want to know who was the first adult to begin to run the show?

I know that if were were talking about the Italian mafia, there are a lot more people who began the criminal underworld at an earlier time.