Isn't it a bit too soon to be making statements like that about what his best position is? He did well a few times as the striker last season under Sherwood iirc.
I would be happy with him in behind Soldado against QPR though.
I guess it is to make definitive statements like that but from what I have seen his skillset definitely matches being behind the main striker. That's not to say in certain circumstances ie if we go two up front he cant be up front. Lets not forget the front 4 is very fluid and Soldado/Ade have been found further back with one of the others going up top so Kane will end up there at certain times anyway I suppose....