Zack is Wack

Former Yankees third baseman Graig Nettles once said, "He went from Cy Young to Sayonara."
He was referring to 1977 teammate and Cy Young Award winner Sparky Lyle who lost his relief ace job to Goose Gossage in 1978.
That quote is also appropriate in regards to Royals Zack Greinke.
Last year Greinke went 16-8 with a 2.16 ERA when he won the AL Cy Young Award.
This year, just a hunch, but I don't think Greinke will repeat. His ERA has ballooned to 4.05 on his way to a 1-8 record.
What happened?
Maybe playing for the Royals is a factor. Maybe he has an injury of some type? Maybe he just isn't as good as we thought he was and last season was a career year.
Since he's making 7-mil this season for the penny pinching Royals, will he find himself on the trading block?