I am building a strong case for keyword cannibalisation happening. Our pages provide product reviews, and the only difference between the keyword cannibalisating pages is the volume of output they produce, e.g brand/model/output-12 brand/model/output-20 brand/model/output-30 Before I proceed into merging same brand, same mode, but different output pages into single one. My questions: How do e-commerce pages that sell brand/model/output individually per page manage without keyword cannibalisation? I had tags and categories at one pointed blocked by robot.txt, but now removed them from the list. Could this be the problem?