I have a pitcher in Kaline, Claude Foster, who by his ratings (splits 40L/57R) should never be very good above AA, but has been just about my best reliever ahead of a couple of pitchers with splits in the 70s for the past couple of seasons. Goes to show how this is not a science, but sometimes abstract art in building a roster. Had another pitcher, Oswaldo Javier, a couple of seasons ago, with huge splits but no dominant pitch, gave me great minor league numbers and got lit up like Christmas in the majors.