Yea they are obviously going to have somebody taking over the mob in the film now that Maroni is dead.
It's just something in the backdrop of the movie that is likely going to be there again, so Alberto Falcone is a good choice.
I almost doubt they'll do the holiday killer thing, unless it's a sub-plot. I wouldn't expect it to be any bigger of a character than Falcone, Maroni, Lao, etc.
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