He just finished top 20 in scoring for dmen (6 points out of the top 10), is significantly better than several of the defenders ahead of him scoring, is one of the most physical dmen going and he did it all while carrying the corpse of Dekeyser around the ice for most of his rookie season.
As a rookie he had a top ~15 season for dmen, and theyre projecting him to do roughly the same this year with a better supporting cast around him.
Unless your answer is he needs to do it more than once, he was clearly a top 20 D last year, so what else does he need to do?