That sounded a bit high to me. So I took a look at US Open programs for 3 of the years Steve won. If I counted correctly, the players in the 32-man fields, other than Steve, who are now in the BCA Hall of Fame numbered 8 in 1971, 10 in 1972, and 10 in 1973.
[And if we count the Straight Pool Hall of Fame in addition to the BCA Hall of Fame, add 2 to each of those counts.]
I expect that the number of players who played in some of the US Open 9-Ball events that Shane won, and who are already in the Hall of Fame, is similar to the numbers mentioned above from Steve's events. And that number will grow in the years ahead as more of Shane's opponents become eligible [Of course, the pool of top-level players is larger overall today than in the early 1970's.]