His OPS dropped 140 points in one year when he was moved to a more physically demanding position at age 32. Certainly keeping him at first could have slowed down his decline.
But for some reason the Sox wanted a big name at first. And in order to get one, they hastened the end off one all star first baseman, traded away another, and walked away from a future Hall of Famer. All to accommodate a guy who didn't live up top his hype, didn't like Boston, and eventually became part of the biggest salary dump in team history.
But on the bright side, we did eventually get a few innings of Carson Smith from this fiasco in the long run. ..