@Krazykopper,
Krazykopper wrote:Could full galaxies have formed in a few hundred million years?
Yes. At their most basic, Galaxies are probably just condensations of Baryonic matter around Gravitationally "dense" areas. As such, they didn't have to accumulate from anywhere, they just had to precipitate out of the super-saturated solution of quantum particles. I would guess they could form quite quickly under those conditions, similar to crystals forming in a super-saturated solution.