The only problem I have with SoS is that by definition teams that the Chiefs play and beat have a worse record (lower SoS and SoV). So a team that sucks but also plays in a tough division will really have a high SoS while the team that wins a division with no other good teams (AFCW) the winner has a lower SoS (and probably SoV as well).
Of course the biggest issue that the NFL season is too short to get truly meaning full data about these things.
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