To be fair, it looks like you only took the Patriots' record against opponents into account, but failed to cross reference that with the other afce opponents' records. Winning an equal percentage of games against non division opponents is good obviously, but it's no secret that intra division games are always tougher. So, the lack of quality of the other afce teams is slightly offset by that rule, meaning that your percentages should in theory be further apart. If the Patriots were placed into a division with tougher opponents their win percentage would certainly go down, but only marginally. I think the point AL is trying to make is that the Patriots would have had a less impressive record over these years if they were in a stronger division, and it would have somewhat affected playoff scenarios like seeding, home field advantage, etc. That being said, I don't think the change would have been as drastic as some would expect, but I believe that's the point he's trying to make