We back our way in if Indy or Cle lose correct?
Yes, If Indy or Cleveland lose, Ravens can lose and get in as the 7 seed, facing Buffalo if they win at home vs. MIA, or PIT if BUF loses. However, I'm writing in sharpie a Colts win, meaning with a Ravens loss the Steelers need to win. What happens in MIA/BUF and TEN/HOU is basically meaningless if the Ravens lose.
Steelers aren't even sending their top starters to Cleveland. Browns favored by 10, Browns should win. All the more reason for the Ravens to handle their business, game is must win.
Given those three outcomes (Ravens, Colts, Browns win) Miami must beat Buffalo to get in, and Miami is the 5 seed, or out with a loss.
If Miami wins, Titans decide the AFC South and the 4 seed. Win and it is theirs, lose and it's the Colts.
If the Colts and Browns win, 538 gives the Ravens an 84% chance of making the playoffs, which means an 84% chance they'll beat the Bengals.
If the Colts win and Ravens lose, they have a 33% chance of making the playoffs, meaning a 33% chance Steelers beat Cleveland.
If the Browns win and the Ravens lose, they have a 10% chance of making the playoffs, meaning a a 10% chance Jags beat Colts.
I don't know the math on the probability of outcomes. But I'd say...
Least likely: Ravens are a 7 seed playing PIT.
Next least likely: 7 seed playing BUF.
Next least likely: Missing the playoffs.
Next least likely: 6 seed playing BUF.
Next least likely: 5 seed playing IND.
Then: 6 seed playing PIT.
Most likely: 5 seed playing TEN.