The same could have been said for Mosconi himself. You can dig him up and turn him to Frankenstein and have him try again. Who knows how long it'd take him. He did it that one time, sure. How many "attempts" did he have before the 526? 2000? It was his first THAT NIGHT, but that's just fate.
Just like John Schmidt went to NYC for an exhibition and ran 150 on his first attempt for an exhibition. John can run 100 on almost any attempt (just using him as an example, I could also say Thorsten, Oliver, Sigel, Mizerak, Varner, Hopkins, Mika, whoever). Randomly, one day, in front of people, he (or they) might be a man possessed and run a mega run too. If John can run 400+ on a 9'er at QMasters, that's every bit of a 526 on a peach basket 8'er. Hopkins has 410, Nagy had 400-something, hell--- even Strickland ran over 400 I believe. STRICKLAND.
Sure - Mosconi was prob the best ever. He wasn't THAT much better than the next 10-20 elite guys. There were PLENTY of guys in history where Mosconi could dog the opening break and sit down for the 150 point game.
Not knocking the guy-- but you're putting the guy on a pedestal that's a little too high over the shoulders of history's other mega champions (many of which have 400+ ball runs on MUCH MUCH tougher equipment).