The rhetoric of theory is always in a bind. It pronounces ideas and denounces failures to accept or grasp them while insisting that there are no grounds either for accepting or grasping ideas.
Paul FryI make a distinction between theory and methodology, the latter being the practical deployment of a premise. Theory on the contrary may well be applied, hence becomes methodology without a hitch, but isn't necessarily practical at all.
Paul FryI don't think theory adds to criticism. (Methodology does, for better or worse.) Theory's function is to make criticism self-conscious, maybe even a little sheepish, about its ex cathedra pronouncements.
Paul Fry