umm what?
the 8 were created by the five together with the centurions AFTER the war.
I have only seen the episode once, so have probably missed a few remarks and details, but I got the impression that the five had made John themselves, and that the others may have been made later with the aid of the Colonies' centurions, or that they had already been designed and built as individuals but then copies were made later for the centurions. I just didn't pick up on any specific details that stated the earliest of the 8 weren't built until after contact with the Colonial centurions. The fact that none of the others knew whoe the Five were or about Daniel suggests to me that John and Daniel were built quite early on, and why would you label the second bult as "7". I'm just not sure about the chronology of events - I think it's possible that the originals of each of the 8 were created on Earth, and that a Daniel that evaded John went ahead, and that the designs were given to the centurions when the Five arrived near the 12 Colonies... It's unlikely perhaps, but given the continuity errors so far, it's probably nothing that needs to be over-analysed.