I disagree. If CIN would have won, they would have been just 1 game behind MIA in the loss column, and the Dolphins would have very little control of their own destiny on that tiebreaker (besides "just win every game"). In contrast, with BAL the head-to-head game looms large. Not only that, but as it stands, MIA doesn't want to end up tied with KC - as MIA loses that tiebreaker outright - and would benefit from a 3-way-tie for the #1 seed.
Tiebreaker for what, though?
You don't need the tiebreaker if you win your division. I am more worried about besting an 8 win Ravens team than a 6 win Bengals team. We'd have to beat the Ravens head to head just to get to where we already are with the Bengals, had they won.