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Well, if space/time is curved, then it's only reasonably to think that some areas of space are more dense [with matter] than others. Due to gravitational lumping, I would then logically conclude that the denser the area, the more matter, the more clumping, and thus the larger the galaxy. Since we know that the Universe is not consistent in the dispersion of matter, it stands to solid reason that even at such an early period in the development of the Universe that there would be rippling, and thus a higher concentration of matter in certain parts.
I'm not surprised to see such a large galaxy like structure at such a distance age. I suspect that we'll find more as time goes by.
Dave
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