I think you're mistaken there. The final five are Cylons created by the humans on Kobol. Back on Kobol, they had the ability to upload but started breeding like humans on the planet they colonized and called earth. For some reason, once they started breeding, they lost the ability to upload until the final five recreated that ability. Yeah, he's pissed because he can't see gamma rays and hear x-rays. The same thing (all this has happened before.....), a human cylon war that must have devastated the planet to the extent all the survivors left to found new colonies. But it seems that that time the humans kicked the cylon's ass since they went on to colonize 12 colonies and the Cylons but one. PS I wonder if FTL was invented later, or if the final five simply didn't have an FTL unit available? Perhaps that technology (like uploading) was also lost on "earth" since the cylons there weren't too interested in traveling?