I think when you take into account the general lack of power the Cubs have in their lineup, you could look at a guy with Bourn's baserunning ability as a major positive. The ability to grab that extra base on a regular basis, whether by going 1st to 3rd on a single, stealing a base, or scoring from 1st on a double, could increase the amount of runs scored pretty significantly throughout an entire season. Now, put him on that Cubs team with Sosa, Alou, Ramirez, and D. Lee hitting 3-6 and those extra bases probably aren't as critical since there's a lot higher likelihood of a home run from those guys than the current roster has the ability to produce.