That depends on how long Byrd will be on the shelf. If its the 15 day minumum, it wouldnt make sense to start Bretts clock for a 2 week stint. However, if Byrd will be out for an extensive period of time, it would be interesting to see them call him up. You'd like to think Jackson's option clock won't be an issue. Actually, you'd like to think that it would. If we're here in 3 years bemoaning the fact that we called up Brett Jackson a month too early and it's now going to cost us $10 million extra in arbitration, I'll be a pretty happy camper as that means BJax will be one heck of a player. On the other hand, if he's going to be that good, why waste him on this crappy bunch so early (like we did with Castro last year). I would have rather delayed Starlin by a month and saved the arbitration money he'll get with a super 2, but whatever. The Cubs can afford it. He won't become a super 2 from being on the major league roster for 15 days. The only way a short-term call up affects him is burning an option year. (Reference Corey Patterson - Debut in 2000, didn't hit arbitration til 2005.)