I remember Brockie for screaming goals in lost causes. I think AK's goals come more from traditional striker play whereas Brockie would score from random places or in random ways (as far as I recall) - volleys from longer range, crosses which caught the wind and drifted in, etc. I think AK is more a pure finisher but maybe hasn't seemed as involved otherwise because we aren't really pressing from the front and he doesn't drop back into midfield at all. Both of those things might be because he's lazy or they might be tactical decisions from Kalezic. I think it's probably tactical personally.
As an aside I love AK's goal celebrations. He seems to get really fired up, they mean a lot to him
The question is really whether AK's job is just scoring goals or if it's pressing when we are defending and dropping back to get the ball and link up more when we're in possession. If it's more than just scoring you could argue he needs to pick up those aspects of his game (assuming Kalezic wants him to press/drop)