If you look at most Stanley Cup Champions, they all have secondary scorers. With Sturm's consistency (he has 8 20+ goal seasons), he will be quite complimentary to Kesler. He will be one of the main guys the Canucks will look towards to showcase his talents in the playoffs, as he's already been there 9 times.
But in this case, I think Sturm can be a primary scorer. With Kesler/Sedins he is 40-50 goal bound.