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Sandy,
It depends on whether you play ROTO by categories or points, but ya, defense doesn't matter in ROTO for position players (which is probably the one biggest blindspot). It DOES teach you a lot of things about $ distribution, building a team, evaluating talent, etc, etc.
While I agree that Young isn't developing, age is VERY relevant for position players. Its rare to even have regulars in the big league that are 22 years old, much less guys that broke in as 20 year olds. Its a sign of a guy thats developed MUCH QUICKER than his peers.
Granted at the big league level hes stopped developing offensively and that is my main concern with him along with the defense and the fact that hes a bad fit for the park.