Ryan Dempster might be ready to take on a rotation role, however, if his BB/9 IP numbers are considered:
2004: 5.65 BB/9 IP
2005: 4.79 BB/9 IP
2006: 4.32 BB/9 IP
2007: 4.05 BB/9 IP
This compares well to most of his seasons as a starter:
1998: 6.25 BB/9 IP
1999: 5.69 BB/9 IP
2000: 3.86 BB/9 IP
2001: 4.77 BB/9 IP
2002: 4.00 BB/9 IP
2003: 5.45 BB/9 IP
If Dempster can maintain his 2007 season control level, including hits allowed, he will allow a lower percentage of baserunners than any other season in his career.