Regarding Dickinson, some scouts have been saying that his future could be as a more defensive defenseman with some offensive pop...a Justin Braun who can get 30-40 points. I can see how his skating, positioning, and stickwork could make him that. Even though he's a great skater, I didn't see the pop and creativity you'd expect of a rushing offensive defenseman.
I don't think Kostin's issue is his effort; he needs to modify his game. In this one, he was making some nice plays holding on to the puck, heading to the middle, and waiting defenses out...I just don't think he has the possession skills to pull it off consistently. He needs to be a complementary player; someone who makes quick plays, moves the puck immediately, and heads to tough areas. Celebrini, Eklund, Granlund, and maybe Smith have the talent to be playmakers...not Kostin.