Originally Posted by duncan_idaho
Basically, yes. Learning something/adjusting/change in approach all mean the same thing.
He went from being primarily a 4-seam, two-seam fastball guy who mixed in changeups to being a guy who throws his 4-seam fastball and changeup at nearly identical rates, and uses his breaking pitches much more than previously.
Exactly, he changed his approach. Sometimes pitchers have terrible statistics their first few seasons before figuring it out, that is still weighted in the career ERA. I don't think there is a more useless stat than career era if it isn't weighted towards what the pitcher has done recently.
Greinke: 3.77 Career ERA
Shields: 3.89 Career ERA
Dickey: 3.98 Career ERA