If I were Edmonton, I'd probably trade down a few spots where Dumba/Murray would still be avalaible to acquire other picks (probably in the 2nd round). I could see Toronto being interested a lot in Grigorenko, same with the Habs. (Assuming the drafting order stays the same)
The Oilers leading scorer on defense is Jeff Petry. He had 25pts this year. It only gets worse from there.
Not going to deny that Edmonton needs a D that will contribute offensively. Edmonton has quite a few holes to fill yet before they become cup contenders. Goalie: The Dubnyk of late may yet be a reliable starting goalie. Roy and Bunz are having good seasons. Defence: pool prospect pretty deep that just needs time to mature. Forward: 2C. Grigorenko could be that 2C.