By Joseph Salvador Travis Kelce wasn’t supposed to run the route that ended up saving the Chiefs’ season. View the original article to see embedded media. The Chiefs are heading to the AFC championship after defeating the Bills via a Travis Kelce walk-off touchdown in overtime on Sunday in what will be remembered as a classic duel for the ages. Kelce’s walk-off grab is one of his top career highlights, but a prior catch from Kelce has perhaps a more interesting backstory. The Chiefs had just eight seconds left in regulation and were down 36–33. All Buffalo had to do was keep Patrick Mahomes fr…