Cooke runs Duncan Keith right where it says "KEITH" on the back of the jersey. Keith runs Cooke on the opposite side of the ice and kept his arm down. There was no elbow. If you want to see elbowing, cross-checking, and 'intent to injure' -> rewind your DVR to Malkin's penalty or watch this nifty video;
Cooke got exactly what he deserved while Malkin should have had a double minor at the minimum.