Well I hate to point out a few flaws. But i will anyway! hehe
The dark galaxy is a definate find. If this is an example of how new dwarf galaxies typically from then we could probably account for much of the missing dark matter, if we can find a few more of them.
But as far as what starts the star triggering process in a galaxy, I think it's a safe bet to say that that begins by gravitational forces during a close pass with another galaxy. There are plenty of examples of this on Hubble Site of galaxies undergoing a star formation burst.
Although I'm not discluding your theroy, it is a less likely method of triggering star formation in a new galaxy.
My gut feeling is that these dark dwarf galaxies will account for about 10% of the missing mass of the universe.
I devoutly hope someone thinks of using that same detection process in some of the dark area's between the galaxy clusters. We might find some dark mega clusters out there.
As to the making of the new galaxy itself, I don't think a naked sigularity built the matter from a GRB. Gamma rays are the most energetic form of light, and less likely to be absorbed or lose thier energy to mass conversion then other forms of light.
However can you site any experiments where light to mass conversion has been done or attempted? I can't recall any such thing, but I'm no expert.
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