Platoon splits. Look at the platoon splits.
BTW - De LaRosa I think is one of the 5 fastest fastballs among LH starters in MLB. (CC, Kershaw, Lester, DLR). DLR at 93.3 last year.
I don't understand speed. Dwight Gooden could throw the proverbial Strawberry through a Battleship yet Sid Fernandez had a significantly higher K rate while never breaking 90.