Joe Christensen in his blog mentioned that the Twins might pick Brad Penny from the release waiver wire. Let's examine whether he will be an improvement over the Twins' current starters.
To analyze this, I will be using the same methodology I used here, looking at PE and xPE:
For Pavano's numbers I am using only his Twins' appearances. Gabino's sample is not significant.
Clearly from the current starters (with Liriano in the DL), Brad Penny would rank third in the Twins' staff behind Baker and Pavano. A low risk high reward pick up that might help the Twins in their pennant run and would be more effective that Blackburn, Duensing, and Swarzak. Dave Cameron agrees with this line of thinking at FanGraphs, using different statistic criteria.
On another note, Carl Pavano and Brad Penny were the #1 and #2 starters for the 2003 World Champion Florida Marlins. Mike Redmond was the back-up catcher in that team.