I did not realize it was assigned years in advance as far as the 6 remaining games go. I knew as I stated above about the predetermined 6 games intra-divisional and the rotating conferences (ie AFC west vs. NFC north one year then AFC west vs. NFC south the next) but did not realize the other remaining 6 games were also predetermined in advance if that is what you are saying.
If that is the case then it makes sense.