First, thanks to Paul Thomas for the very kind words. They are very appreciated.
To Mike Trenham: Bobby Jones played in one Western Open, the 1921 championship at the Oakwood Club in Cleveland, which was won by Walter Hagen. Jones, however, was the leader after 36 holes, scoring 69-70 for 139 on the first two days, and had a one-stroke lead over first round leader Emmett French. Jones blew up to 83 in the morning round on the final day, finishing with a 73 and tying for fourth with Joe Kirkwood, eight strokes behind Hagen. Jones was the low amateur. (Incidentally, the field scoring average for the third round was 79.909. Hagen shot 73, while the low round was George Bowden's 70.)
As to the Western Amateur, Jones played twice. In 1919, at age 17, he lost in the first round to Ned Sawyer at Sunset Hill Country Club in St. Louis. In 1920, he raced through stroke play qualifying to win the medal by eight strokes (scoring 69 in the first round to set the course record at Memphis Country Club), then advanced to the semifinal, where Chick Evans beat him 1 up in a 36-hole match.
Macdonald Smith won three Western Opens (and played in only seven): 1912, 1925 and 1933. Like Harry Cooper (winner in 1934), his major championship wins are not counted by most modern followers of the game.