that's not true at all. they traded him because ryan howard had been destroying the minors for 3 years, came up and played part time as thome struggled with injuries in 2005, then full time when thome went down for the year, and hit so well that he won the rookie of the year despite only playing about half the season. obviously howard and (age 35) thome were 1b only, so one of them had to go away, and the obvious choice was thome since the phillies weren't going to deal away a 24 year old who had emerged as a franchise cornerstone. Ryan Howard is why they wanted to trade him, Thome's fielding (or lack thereof) is why he was heading to the AL. it made the most sense to trade him to the AL because of his elbow injury (pretty sure he was suffering from back problems as well - playing the God-awful veterans stadium astropavement surely didn't help). it's hard to say what would've happened if he'd been in an mlb where he had to continue fielding... maybe he would've stayed out long enough to get healthy, maybe he would've been a part time player, maybe he never develops back problems in the first place because veterans' stadium/astroturf don't exist. scott rolen was another guy who had persistent back trouble playing in philly and had it magically improve after leaving to play his home games in another ballpark.