If any player can score 10+% of their team's goals on the season, defensive shortcomings can be tolerated. And nearly every 30+ goal scorer in the NHL is scoring at that rate, unless you are some sick offensive team like Tampa last year.
Now, can you be one of the worst defensive zone players in the league on a Julien-coached team? Doubtful, because you won't see the ice. But that's a problem for another day.
I'd like to see him give a bit more in all zones at the next level, and I expect he will, largely because of who our team is coached by. He simply won't last under Clode if he checks out defensively. And it doesn't look like Julien is going anywhere, anytime soon - unfortunate as that might be.