When there was a claim that there were 15 pitchers available to the Twins that were above average starters ERA+ was used as the designated statistic. ERA+ is computed using all of the pitchers. Regular starter, relievers, pitchers who pitched hurt and sucked, as well as the replacement level pitchers. If you use xfip as your measuring stick a different picture emerges. The years of 2009 through 2012 were used. A minimum of 300 innings pitched over that time leaves Grienke, Sanchez, Jackson, Haren, Baker, Myers, Dempster, Liriano, Lohse and Marcum as with the only starters available with a sub 4.2 xfip. When you reach 4.2 Fangraphs decrees that you are a below average pitcher. After being released or traded I do not think that Lohse, Liriano or Baker would be coming back. Realistically that left Haren, Myers, Dempster and Marcum as the reasonable potential Twins that were above average pitchers.