"When you hear hoofprints, think horses, not zebras."
You can always contrive a more complicated structure to explain some observation.
There is no evidence branes exist. We are looking for an explanation to the "dark matter problem" that doesn't require asserting that a ton of new and unproven physics exists.
This may point to a key problem in the hypotheses, theories and conclusions. When you are in Africa, a "think horses" paradigm, may lead you very astray in your thinking.
You can always contrive a more complicated structure to explain some observation. There is no evidence branes exist. We are looking for an explanation to the "dark matter problem" that doesn't require asserting that a ton of new and unproven physics exists.