I am not guessing about Oswald working for or an associate of, Carlos Marcello. Oswald has been sighted in the company of Marcello several times in both a restaurant owned by Marcello and at Marcello’s ranch.
Oswald admitted he was a patsy, we all saw it on television.
The Sicilian custom I read about in a mob book I read so I am assuming that’s true and not a guess.
Tippit and Oswald confrontation who knows but I wasn’t the first to suggest it, I read that in one of the many books I have read about the assassination.