I want to know the answer to the following question:
What other painters were not thought of as being as Cubist as Braque and Picasso?
All the background I'm provided with is that "It is difficult to apply to painters such as Jean Metzinger, Albert Gleizes, Robert Delaunay and Henri Le Fauconnier, whose fundamental differences from traditional Cubism compelled Kahnweiler to question their right to be called Cubists at all.". Is that enough to answer the question?
Answer: yes