Once they had a better SS in ARod, it made sense to move Jeter to 3b or 2b. After they got ARod, they only won one other WS after winning 4 previously. Jeter was a decent SS in his early 20's per the metrics. His first bad season wasn't until 2000. So the Yankees won 3 WS when Jeter was a "good" SS (3 in 4 years) and two when he was a "bad" SS (2 in 15 years). However, he had a good defensive season out of nowhere in 2009 (3 DRS) so maybe his good defense helped propel them to a title that season. If ARod's better defense had been at SS from 2004 on, maybe they win a few more?