Okay, the argument has shifted from just an established player moving, but an established in-their-prime star. Here's an admittedly incomplete list of Hall of Fame players whose careers started after 1900 who were already established at a position and changed positions sometime betwen the ages of 24 and 33 (catchers excluded). I just went down the list on baseball reference and clicked on guys whom I seemed to recall a position change for. Ernie Banks moved off SS at age 30. George Brett moved from 3B to 1B at age 33. Rod Carew moved from 2B to 1B at age 29. Andre Dawson moved from CF to RF at age 28. Hank Greenberg moved from 1B to LF at age 28. Rickey Henderson moved from LF to CF at age 24, then back from CF to LF at age 28. Al Kaline went from RF to CF at age 29, then back to RF at age 31. Until very late in his career, Harmon Killebrew never really settled down at a position... spending a year or two at 1B, 3B and LF and shuffling through all of them again later in his career. Fred Lindstrom went from 3B to OF at age 24. Willie McCovey spent his first 3 years at 1B, then moved to the OF, then back to 1B at age 27. I'm not even going to try to list all of Paul Molitor's position changes. Rest assured, they started early and never stopped. Stan Musial moved from OF to 1B at age 33. Tony Perez moved from 3B to 1B at age 29. Kirby Puckett moved from CF to RF at age 33. Sam Rice moved from CF to RF at age 32. Frank Robinson moved plenty between 1B, LF, and RF beginning early in his career. Jackie Robinson moved from 2B to OF at age 33. Babe Ruth switched from P to OF, obviously... but he also spent almost his entire career splitting games between LF and RF every season. Joe Sewell moved from SS to 3B at age 29. Al Simmons moved from CF to LF at age 25. Duke Snider began moving from CF to RF at age 31. Carl Yastrzemski played in the OF til moving off for 1B at age 29. He spent one year there, moved back to the OF for one more year, then back to 1B for most of the rest of his career. And of course there's Robin Yount switching from SS to CF at at 28. Players change position. Even good ones. Stop pretending it's such a big deal.