His defensive War is 9%. That's not over blown.
War is a better stat in Baseball. Hockey is too complexe for War to be very effective and catch the varied situations and varied flows of the game. It is an indicator, sure, but you have to use it delicately.
I rather check the toughness of opposition, the capacity of driving play, the zone starts and the ice time all together. I think it gives a better and more complete picture of what the player can do.
In this sense, what I can see is that Huberdeau is average defensively. But since he is being used most of the time as an offensive threat, he isn’t frequently used in a defensive role.
So… I would conclude that when he is in that defensive position, it is because something already went wrong on the ice and he isn’t the only one responsible.