The Colts got crushed late in the season on defense because of miscommunication and bad schemes in certain situations. There were several plays late in the season where the defense would give up massive chunk plays, which was uncharacteristic of this defense.
A big part of it was miscommunication in the secondary, especially the safeties. Malik Hooker and Khari Willis weren’t on the same page most of the time once Willis took over full-time as the starter. That’s where the majority of the big plays happened.
The team had issues with scheme too.