If Lowell stays healthy, he'll post better numbers during regular season. But he's not as good of a fielder as Mueller, nor is he as tested in the playoffs. Time will only tell.
They need to pick up some base speed and some clutch hitting on that team. Their bench is what won them a world series in 2004.
Chicago bias aside, I think both the Cubbies and White Sox are going to surprise people this year...for better AND worse.