Well, if Youkilis would had been a second baseman like i believe 700 posted earlier it wouldn't had been his fault, but since he doesn't have the quickness or range for second base and only can play a corner position with his kind of production its a problem.
Example; Some Sox fans and not baseball evaluators taught that Youkilis was going to be third baseman of the future, baseball people new well about Youkilis lack of bat speed (the main reason for lack pf power) and his short commings. Spann on the other hand is a lot more athletic than Youkilis with the potential one day of been a plus defender at the hot corner, in addition its the type of hitter that while he may never have Youkilis OBP he may be a better in the ML than in the lower minors, specially in the production department another words a better hitter than Youkilis.
Guys I am not saying that there isn't a future for Youkilis in the ML, just that not as a starting corner player and ideally if not traded this Winter he could spell Lowell, Manny and the new first baseman and play about 70-80 games, maybe more as a defensive replacemet for the first baseman.