Yeah... he had a good year when he was used in an offensive role with offensive players.
Last season he had a poor year offensively when used in a defensive role with offensive players. This season he did poorly offensively when used in a defensive role with defensive players. I'm not sure why any of this is a surprise or a sign that he's regressed/has no heart/blah blah blah.
Anyway this is all a moot point because Kulemin would be an idiot to re-sign here.
You're conveniently omitting 2011-12. He was played with offensive players in an offensive system and scored 7 goals.