> 6. Fresh blood in the rotation allows starting pitching to improve dramatically with a group ERA a little above 4. This would get the rotation back to about MLB-average and, despite an increase in IP, result in -100 runs allowed. I thought about this some more. Unlike your analysis position-by-position for the batters, the situation for starting pitching cries out a little bit for "show your work". Here is my rough cut at it. The Twins employed 12 different starting pitchers in 2012, none of whom had a full workload of 32 or 33 starts: so I grouped them together in approximately 32-start bunches, which happened to work out neatly except I had to split Duensing's year into two slots. Hopefully, the following arithmetic doesn't contain major mistakes (I had to guess in a couple of spots), the assumptions I made are sound (e.g., 6+ innings per start from a successful staff), and the work is reasonably self-explanatory. Sorry, I don't know how to change the font so that columns of numbers line up; the bottom lines and differentials are meant to be in units of Earned Runs, in keeping with your analysis. The conclusion I draw is I don't really see where a savings of 100 runs is possible from the 2013 starting staff in its current state. Around 50 seems the best to hope for. This is because DeVries and Deduno had better ERAs than we probably choose to remember, limiting the upside possible from upgrades. Starters going deeper into games somewhat skews these run counts (100 runs by a #5 starter going 6+ innings all the time is obviously better than the guys in 2012 giving up 100 in only 5 innings), but I think you have already taken this into account by assuming fewer runs given up by the relief staff given a lower work load in your bullet item #7. Starts ERA ER Diamond 27 3.54 68 Swarzak 5 8.10 21 --- 89 2013: Diamond 3.50 80 Diff: -9 Blackburn 19 7.39 81 Vasquez 6 5.68 20 Marquis 7 8.47 32 --- 133 2013: Worley 4.00 90 Diff: -43 Liriano 17 5.31 54? Pavano 11 6.00 42 Duensing 4 6.92 15 --- 111 2013: Correia 4.50 100 Diff: -11 Deduno 15 4.44 39 Walters 12 5.69 39 Duensing 7 6.92 25 --- 103 2013: Gibson 4.50 100 Diff: -3 DeVries 16 3.99 38 Hendriks 16 5.59 53 --- 91 2013: Some guys 4.50 100 Diff: +9