Something to keep in mind:
8-5 Jacksonville has already defeated 7-6 Indianapolis. So if the Jaguars win, the Colts cannot win the division; that victory will clinch the AFCN for Jacksonville. Absolute best the Colts could hope for is to go on the road as a wild card team.
If the Colts do happen to win, it's no guarantee they win the division. Jacksonville's last two games are home against the Redskins and then at Houston - two very winnable games. The Colts would have to travel cross country to play at Oakland, and are then home against Tennessee.
However things do look good for the Colts if the two teams finish tied. As far as tiebreakers go, if the Jags win, they win the division even if both teams finish 9-7 because they would have beat Indy twice. If the Colts win then the next tiebreaker would be division, which would come down to the two week 17 games (Jax-Hou, Ind-Ten).
After that the next tiebreaker is common games. Simplest way to figure that out is to just remove the two games that are not common games: Indy lost to the Pats and beat Cincy; Jacksonville beat Cleveland and beat Buffalo. So subtract 1-1 from Indy's record and subtract 2-0 from Jacksonville's record; in case of a tie Indy wins the common opponents tiebreaker.
Incredible to think that things may once again come down to a week 17 game between the Colts and Titans.