The head was the principle point of contact, even though he obviously wasn't targeting it. Plus, Landeskog made a classic rookie mistake by not keeping his head on a swivel and understanding who is on the ice, and got rocked for his trouble. All of that says 1 game minimum given the headshot crackdown, but his record gets him 5. Not surprised one bit by this decision. If it were me, it would be no suspension and Landeskog hopefully learning a valuable lesson, but that is no longer acceptable in today's NHL.
Bylsma + coach = No Cup. You suck at math, Mario and Ray.