One thing about the Bills that is very overlooked is that the offensive and defensive lines are pretty solid, so yeah the QB is in a groove with the 2 WRs, and yes the D-backfield has 2 Pro Bowlers, but the front lines are the difference. They block and protect well and the D-line is solid in pass rush, and looks much improved against the run.
How was this team built?
2021:
1st rd. Greg Rousseau DE
2nd rd. Boogie Basham DE
3rd rd. Spencer Brown RT
2020:
2nd rd. AJ Epenesa DE
2019:
1st rd. (9th pick) Ed Oliver DT
2nd rd. (38th pick) Cody Ford RT
2018:
1st rd. (7th) Josh Allen QB
1st rd. (16th) Tremaine Edmunds ILB
3rd rd. Harrison Phillips DT
2017
1st rd: Tre White
2nd rd: Dion Dawkins
2016:
1st rd. (19th) Shaq Lawson DE
And also 2 of them not currently with the team:
2016:
2nd rd. Reggie Ragland ILB
3rd rd. Adolphus Washington DT
So, draft after draft after draft for six straight years, you focus on blocking up front, pass rush and stopping the run, you stock up those front lines impressively.
This is a lot of picks to expend on those positions, and comparatively they struck gold lower in the draft with CBs and OLBs like Milano, Taron Johnson, Dane Jackson and Benford.
About the only places they've failed over the years are at WR (Gabriel Davis is good but Zay Jones, Watkins [2 first rounders for him], Goodwin, etc. are not) and RB (I'm a bit underwhelmed by TE too).
But they spent 12 prime round picks in 6 years on OL and DL? That's a lot.