I'm becoming more and more convinced that light isn't the only particle that can interfere with itself, and that the behavior may instead be a function of a particle's level of interaction. The multi-galaxy collision we witnessed not long ago may have been the first time we've had the scale needed to test that theory. Quantum uncertainty cannot be observed in laboratories or colliders because the time scales would allow us to violate causality. If dark matter is a boson (pure higgs of some sort?), it would make sense that it could gravitationally interfere with itself in multiple galaxy collisions. The key being that nothing had the opportunity to stop or alter these interactions, but each interaction had multiple spacial outcomes with equivalent probabilities. "Observation" actually just denotes a probability of interference, and these ultra-massive, low-interacting galaxies would create plenty of uncertainty, and any line of thought which leads to "We can't observe that" also leads to reverse causality, in my mind sealing up that argument. The smaller, brighter masses of the continuing galactic parts of collision observed were likely sling-shotted through because of the massive gravitational pull of the early dark matter interference, which likely significantly subsided in strength as the dark matter uncertainty was reigned in by the pull of the gravity of the normal matter. Why? Since normal matter can interact with so many more particles/forces, It's level of uncertainty is reduced by the number of nearby particles which could interact with it. Therefore, it's gravitational footprint would remain relatively static and condensed. This would cause jet stream like fields to form in the dark matter as the densely certain mass imposed just a bit more certainty on the dark matter around it, reducing the net gravitational pull. If gravity turns out to be a function of the Higgs mechanism, it will be interesting to see if it can be depleted due to massive objects. If so we should see fewer interactions, and therefore lower resistance through that field. This IMHO is likely what gives rise to gravity, accelerating objects near mass due to lower space-time density. Either the Higgs is directly linked to space-time, or it is space-time. TL;DR; I propose that Dark Matter's low rate of interaction gives rise to gravitational interference due to a higher interaction with the Higgs. As an echo of quantum uncertainty, it gives rise to large fluctuations in gravitational fields acting on normal matter. Normal matter counteracts this gravitational interference through via higher levels of certainty imposing on dark matter. Uncertainty seems to be a property of particles most purely interacting with forces.