There's still the problem of the 12 Colonies original flags. Why in the galaxy would they only have star patterns visible from EARTH? (The same patterns that confirmed they had reached Earth) It's been implied the 12 never went TO Earth, so what gives, if they were never ever there? You don't put a star pattern on your Flag if it has no significance to you.
Yes, thank you. I don't think this has really been explained yet. If everyone did start on Kobol, and then during the exodus, 12 went to the colonies, 1 went to Earth, then how would the 12 know of the 1's constellations? The only way for them to know is for Earth to be the originating spot.