I just ran a few scenarios
from their default you give a Bills win in all 4 games, they make the playoffs.
change AFC outcomes to reasonable selection and you can have it where
the Bills lose to Denver, then WIN vs GB, Raiduhs, and NE they make the playoffs
the Bills WIN at Denver, lose vs GB, WIN at the Raiduhs, and WIN at NE they make the playoffs
however IF
Bills WIN against Denver, GB, and Raiders, yet lose to NE they FAIL to make the playoffs ....
WTF?
the key is BEATING NEW ENGLAND!!!