Here is a comparison of Starting Pitchers in the Twins System, starting with the Major League Starters, down to the Minor League Prospect Starters.

Major League Rotation:
1-Johan Santana
2-Carlos Silva
3-Matt Garza
4-Scott Baker
5-Boof Bonser
6-Glenn Perkins
7-Francisco Liriano

Minor League Rotation:
Nick Blackburn, 10-4, 2.60 era
Kevin Slowey, 10-5, 1.89 era
Brian Duesing, 15-6, 2.95 era
Anthony Swarzak, 5-4, 3.23 era
Jay Rainville, 9-11, 3.29 era
Oswaldo Sosa, 5-5, 2.23 era
Kyle Waldrop, 7-5, 3.40 era
Jeff Manship, 8-5, 3.15 era
Yohan Pina, 4-3, 1.73 era
Alex Burnett, 9-8, 3.02 era
Cole Devries, 9-5, 3.41 era
Tyler Robertson, 9-5, 2.29 era
Mathew Fox, 7-2, 3.50 era