The logical problem with the assumption that very far away ordinary matter, in a fractal distribution, can give rise to an effective (fictitious) local matter density that explains the cart wheel rotating motion of galaxies, is that this Far Away Matter (or FAM) would have to be far away relative to every single galaxy in the known Universe. FAM would have to be far away -- and this is the key -- not near any galaxy. That is, it could not be inside the Universe.
But if we assume that FAM is composed of ordinary matter outside of our "Universe" -- that is, outside of our Big Bang -- can we develop a consistent theory? It has yet to be developed.
A hint lies in the new finding of the James Webb, which appears to find galaxies that are older than our Big Bang, hence originating from another adjacent big bang.
If we keep looking far enough, I suspect that we will accumulate data that is consistent with a fractal distribution of all the big bangs outside of our own. And so an extension of the Carati Theory will make the concept of Dark Matter irrelevant as an explanatory tool.
Proving the Relativistic Energy-Momentum relation, the hard way and the easier way.
This adds the proof for the relativistic mass effects from motion, proving that gravity causes it.
