Wellllllll, that's kinda not a very good interpretation of a pitcher's value. Team wins are contingent on things out of a pitcher's control (like say offense and the team's defense) I shall demonstrate:
Pitcher A goes 18-5 with a 6.7 K per 9 and 2.3 BB per 9 3.79 ERA and FIP over 202 inn.
Pitcher B goes 13-7 with a 9.6 K per 9 and 2.2 Bb per 9 2.88 ERA and FIP over 203 inn.
who was better? Who provided the most chance of winning for his team? I would say it's obviously player B, his higher K/BB ratio meant less stress on his defense, his lower ERA and FIP meant he was allowing less baserunners and run scoring chances.
The difference in wins can be summed up by revealing who they are:
Pitcher A is Cliff Lee for the 2010 Indians who went 93-69 that year
Pitcher B is Jake Peavy for the 2010 Padres who went 82-80 that year
If you put Peavy on the Indians you would expect his wins to go up a lot just by having a better team around him.
To use your Greinke Kershaw comparison, if they had played for the Twins the past 5 years their wins would be much lower and so the win stat ,in and of itself, doesn't tell us much about a pitcher's production.
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"The large print giveth and the small print taketh away."- Tom Waits
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