That would be impressive considering they just lost their QB for the season and they play the Seahawks, 49ers, Jaguars and Texans.
Colts were looking really good but their QB was playing hurt and they started to regress and now he is out while the Jags and Texans are playing really well. I don't see the Colts winning the division. They probably have to win all four of their remaining games. Even if they finished tied with Jags or Texans they will lose on the tiebreaker because both those teams will have better conference records.
Jags make the most sense since they have a one game lead on the Texans and the tiebreakers are really close. The texans have the tiebreaker right now but only because Jags have played less divisional and conference games.