Greinke looking like Pedro in his prime

Orel Hershiser makes a comparison that had occured to me, looking at Zack Greinke's early season line:

6-0, 45.0 IP, 2 ER, 8 BB, 54 K, 0 HR, 0.40 ERA

Pretty exciting. I had been a big believer when he first came up at an extremely young age. Then he became mentally ill and, possibly as a result, awful. Having come back from that, his 2008 was quite good but still not good enough to suggest he'd suddenly become untouchable. Yet that is what seems to have happened.