It has always struck me as fairly amazing given that he was actually reasonably famous in his own time that one of Mosconi's straight pool championships was not filmed. It is truly a shame.
A long time ago (1988 or so), I went to West End billards in Elizabeth NJ, (I think that was the name) and they had this amazing in house tournament that had known pros like Mizerak and Hopkins playing in it. It was won by an older guy (possibly Cicero Murphy though he seemed older than Cicero would have been at the time, and I seem to remember them calling him Old Man Jesse or something like that) Anyway, he was just an amazing shot maker especially on long difficult cuts, and played sort of long position to take those shots when he could have loaded it up with something and gotten closer. But he just didn't miss.
I went up to him and asked him why he took those long shots and his answer was "Can you make that shot from 3 feet?" I nodded. "Well you should make it from 9 feet then"
Mosconi came up in the conversation at one point and he said that he had played with him and been around him for many years.
He said that Mosconi was far and away the best player and not just at straight pool. He said that Mosconi, especially in straight pool, shot so fast that you didn't have time to even register how difficult the shot he just made was. He could run entire racks of straight pool in a minute or so and get perfect on every shot. He said a lot of people had grown to think that Mosconi was not as good as players like Lassiter and Worst in 9 ball, but he said that was not true, that he could give those guys the "7 out and rape 'em" but Mosconi just wasn't really interested in the other games that much.
Just one man's opinion, but Mosconi was still pretty strong in his 70s in the Fats thing and then those Legends of Pool tournaments, but there is just nothing at all of him in his prime when he was essentially unbeatable. There was another guy I knew that said he know Mosconi from Ames and said the same things about him. He was right age but I have no perspective if anything he said was true.
I played Willie in some random event in LA where you paid $10 to play him a game of 9 ball, and broke and ran out on him. He dryly told me to "not let that go to my head". I still have a signed program from a Willie Mosconi tournament at Hard Times in Bellflower that Earl Strickland won.
Watching Willie play in those Fats matches is what got me interested in pool and I have always looked for whatever I could on him. But it seems all lost.
One more story from my West End trip. I saw Mizerak lose hundreds and hundreds of dollars betting some random dude with a house cue, on a straight in diagonal corner to corner shot with object ball in middle of table and cue ball inside the pocket. Mizerak kept jacking up and missing badly and this other guy was able to sort of slow roll in with topspin. It was clearly "his" shot but it was pretty fascinating to watch.