Rolen had close to negative value last year, as he was dealt for a problem in Glaus. Overbay is a good stop gap, but not much better than a FA pickup like Hatteberg, and much spendier. Hence, Prince and Alcides for Halladay...I like getting pre-FA guys if I'm trading pre-FA guys. That deal would add payroll, add age (which makes the team more injury prone), and as RCB pointed out, rest almost entirely on the arm of a guy who is very good, but has thrown 700 innings since 2006, and ain't getting any younger. I'd much rather focus on adding guys like Ian Snell and Adam LaRoche if trades of the core are made.