That's untrue.
Actually he never threw a knuckle-curve until his stint in Toronto a couple years back. He was mentored by Halladay and changed his grip to a knuckle-curve to get more control as well as a sharper break. The spin is alot tighter now, which is why people want to give him a slurve or sweeping curve pitch.
Prior to that he had that big 12-6 curve during his time with the Marlins.
FYI
