This question is related to my previous question on Solar System Formation and is a pure thought experiment, with as few as possible assumptions made.
From my previous question, I learned that stars form from the condensation of a very large cloud of gas, producing perhaps 1,000 (or more) stellar mass objects.
I also learned that it usually takes a trigger, a shockwave from a supernovae or another giant gas cloud "bumping" into it, to start the condensation process. Without a trigger, collapse of a extremely low density giant gas cloud on it's own will take a very long time.
Currently, we do not have any evidence as to how the gas cloud, that our solar system is part of, collapsed 4,500 million years ago.
Now consider what we know about dark matter:
It is not considered to be present in significant amounts in the galactic plane, but rather forms spherical halos surrounding the galaxy, stretching far beyond the visible matter in the galaxy.
The Wilkinson Microwave Anisotropy Probe (WMAP) showed that the existence of dark matter is favored, implying that dark matter has been present in our universe for as long as ordinary matter has.
Another point to bear in mind is that, without a dark matter halo, the arms of a spiral galaxy will be unable to maintain their shape over the lifetime of the galaxy.
Now assuming that the collapse of our giant gas cloud was not caused by a trigger, we have no evidence as to how the collapse occurred.
Assume that the dark matter is in a spherical halo around the gas cloud - obviously it will not be perfectly spherically distributed, it would almost certainly have higher concentrations of dark matter in some areas than others.
These dark matter mass concentrations would have drawn clumps of the enclosed gas cloud together, increasing the density in the clumps and allowing gravity to pull together protostellar cores, which eventually brought about the galactic structure of the present Milky Way.
My question is, given that we don't know by which method our star cluster was formed, is this scenario as plausible as any other or have I made wrong assumptions along the line?