If you lay out our special teams you really see where the issues are. PK is ok with guys like: Abby, Glendening, helm, Miller, Z, datsyuk, Nyquist, Sheahan, and Jurco at F then DD, Kron, and E at D.
It is the PP that has major issues. PP1: datsyuk and Nyquist are the puck movers, no one to work in front of the net and down low with only Kronwall on the BL. Need a big body up front and a RHed shot.
On PP2 it is the same problem: Z and Weiss as your puck movers, no one down low/front of net, DD on the BL. Again need a big body for up front and a RHed shot on the BL. That makes 4 holes on the team. 1 of the 2 holes on the BL could in theory be filled by Sproul or Marchenko. But both are very young with a year or less in pro hockey at the minor level.
As for filling the holes down low/front of the net the only young guy that could possibly do it is Sheahan. That would mean 2 guys in their 1st/2nd years filling major roles. That is very risky and would be wasting Datsyuks talents and time.