Pie has to learn to hit LHP some time. Since the callup he went 1 for 4 with an RBI single and no K's against James. He hasn't looked overmatched, and more importantly, he played and Pagan did not. Even if he does struggle against them, he'll still be a signifcantly better defender than Pagan, in a lineup with 3 great RH hitters(Lee, Ramirez, Soriano), and several more with outstanding splits against LHP(Barrett, DeRosa, Murton), so he's not going to drag the offense down.