>The CMB is extremely smooth, but visible matter is highly clumped up. This can only be explained by a huge amount of matter that doesn't clump up ie non-baryon

>The CMB is extremely smooth, but visible matter is highly clumped up. This can only be explained by a huge amount of matter that doesn't clump up ie non-baryonic This is not correct. Datk matter's presence is inferred from the CMB anisotropy not because it doesn't "clump up" but because it does not interact with photons (EM field). Inflation is responsible for excess smoothness. In fact dark matter drives regular matter to "clump". See eg: https://physics.stackexchange.com/questions/61239/how-the-cmb-anisotropy-is-linked-to-the-existence-of-cold-dark-matter-and-dark-e https://physics.stackexchange.com/questions/61239/how-the-cm... >every single one of those discrepancies is solved exactly This is quite an oversell as far as I know. The margins of error on these calculations are often large. In particular the version with a slightly modified gravity field and smaller amounts of unobserved regular matter is not too outlandish. What would be needed to exclude this is a proof that the amount of unobserved matter cannot be reduced significantly by modifying G, which has not been written yet.