Found this on Dyers website Untold Stories
I recently posed this question to historian Charlie Ursitti: which player really was best. Charlie is an expert in the field, having recently created a website with more than a century of pool statistics. He is a man of strongly held opinions when it comes to pool. Charlie’s answer to me was emphatic. Without a doubt, he said, Mosconi was the superior player. Charlie says this is not simply his opinion, but rather the indisputable conclusion one must draw from examining the facts.
“I statistically proved that Willie was better,” said Ursitti, recalling to me an analysis he conducted some 20 years ago. “He (Mosconi) won 76.3 percent of the games and Greenleaf won 70 percent of his games.” Charlie said these numbers, first published in an article for The National Billiard News, did not sit well with Greenleaf's fans. “I got more hate mail than anybody had in 10 years. They’d say: ‘you don’t know, you never saw Greenleaf play.’ I said both of them played in competition, I never saw them (play against each other) — all I did was present the numbers. And the numbers don’t lie.”
As for Walter Lindrum he was playing English billiards. Totally different discipline like comparing apples and apple pie. 4 balls no clusters and a dizzying array of ways to score.