I watched the documentary and also read the book about Frank Matthews a few years back. Definitely an interesting figure.

While he may have had more money than any individual mobster, I wouldn't say he was more powerful than the mob as a whole in its prime. The mob had control over so many businesses, both legal and illegal, and was able to endure for decades, whereas Matthews made heaps of money selling drugs then disappeared. His organization disappeared with him.

Also, this might sound nitpicky, but they claim Tommy Lucchese lived on Todt Hill in Staten Island and was pissed off that Matthews moved in next door to him. From what I've researched, Lucchese lived on Long Island and probably would have been dead by the time Matthews got big.