Was reading what Charlie not sure of his last name said and described the way played and he saw alot of Mosconi matches. The way he described how much he dominated ,the runouts and weren't those matches round Robin. He saw lots of great players and said nobody compared to him. Granted he didn't see some of the more modern players. As well as they pocket balls put them on those old 9 fters with that slow cloth, inferior balls even with bigger pockets it would be interesting to see how they would play. Also even though he thought 9 ball was an easy inferior game those who saw him play said he would have been dominate it that also.
Surely, you are referring to Charlie Ursitti, Mosconi's business manager, a great ambassador for pool in his day, and a BCA Hall of Famer himself. Yes, it is unlikely that anybody saw more of Mosconi's play than Charlie. Irving Crane said, more or less, the same of Mosconi, that he was a full cut above the competition, including legends like Irving himself, Caras, Lassiter and Cranfield.
Charlie, whom I counted as a friend, died close to a decade ago, so he got to see all the old-timers as well as many of the current crop. He's right to suggest that Mosconi's level of dominance was possibly greater than that of anyone that ever played pro pool.
Let's add that Mosconi may have been the only player of his generation that was truly accessible to most American pool fans. He played in an era where the was no streaming, and TV coverage was very rare, so the only people who got to watch him were those who watched him play up close. As Brunswick's player rep, Mosconi traveled the country, playing hundreds of exhibitions over the years in the poolrooms of America. These exhibitions did a lot to promote the game.