Let’s not forget the great Johnny Layton was a 3cushion world champion 13x and won 2 14.1 championships!
Greenleaf got 3rd and 6th in two 3c world championships with averages of .880 and 1.06 grand averages respectively. Greenleaf and Hoppe battled twice. Greenleaf lost 600 to 362 in 561 innings and 600 to 527 in 656 innings, averaging .645 in the first and .803 in the second.
Greenleaf imop was the greatest innately gifted mind that billiards/pocket billiards ever produced. Worst being a close second, but arguably our greatest cueist.