You can't compare anything from last year to this year. The supporting cast is significantly worse.
Arch looked pretty good when he played with last year's supporting cast and the teams he played stunk but were better than some of the teams he struggled against this year.
Last year's offensive line was so much better than this year's it's not even comparable and the WR and TE room were also significantly better. The biggest issue is that Sark didn't have this year's team ready to reload where they needed to.
Sunderland 'Til I Die was a documentary about hubris gone very wrong and was great for that reason. The UNC football doc would've been the same. It's a shame they killed it.
Variance comes for us all. The Chiefs had won 17-straight one-score games entering this season (including the postseason), but fall to 0-3 in one score games this season.