This has all been confirmed through the Elias Sports Bureau. Here is its breakdown:
Denver clinches AFC West with a win against Tampa Bay or a San Diego loss against Cincinnati on Sunday. If both Denver and San Diego finish 8-8, the Broncos own the tiebreaker due to a head-to-head sweep.
Oakland is now eliminated from winning the division. If both Denver and Oakland finished 8-8, they would split the head-to-head matchup and would be tied with 4-2 division records. But Denver has a better record against common opponents (7-5 to 6-6). This is the next tiebreaker for division the, followed by conference record.
If there is a three-way tie between Denver, San Diego and Oakland, Denver would hold the tiebreaker because of the better to head-to-head record.