The Colts are a good team, but they are much different on the road than at home. They will clearly be favored over KC, but it would not be a "miracle" for KC to win. Colts have lost by 20+ points on the road to the Bears, Jets and Pats; and road wins were against Tenn in OT, Detroit in the last seconds, and a 17 point win against Jax in the Gabbert injury game (note Jax won at Indy in weeks 3).
People talk like the Colts are some Juggernaut.
It took a lot of lucky breaks for them to beat GB, Detroit and Tenn. They could easily be a 6 win team. And let's not forget, the Jets pasted them at The Met.