Vorobyev was good on the PK, I think because he could use his reach in that role, hounding the puck handler at the point (Hayes is great at that), but PK is not really a test of defensive IQ for a forward.
Face it, Vorobyev is allergic to contact, and that's a problem when you're a big center with average speed. He's an excellent passer, but what else does he bring to the table? If he won't forecheck and hit anyone, well, if you want to play like a 180 lb center, you'd better skate like one as well.
Which is why I think three years in the KHL will do wonders, he'll have to improve his defense and will get the opportunity to sharpen his offense, which has to be much better given his flaws to make it in the NHL.
He has been my biggest disappointment among Flyer prospects, given his size and offensive skill package, I thought he had a chance to be a solid two way 3C.