Harris previously played in Denver so this is actually more of a homecoming for him.
Clady, the Broncos starting LT, tore his ACL on Wednesday and is expected to miss the season. It sounds like a big injury and it is but the Broncos lost him for most of the 2013 season when Peyton Manning had arguably the greatest quarterback season in history. So maybe they can overcome it.
Harris got a shot with the Chiefs last year after Donald Stephenson was suspended for the first month of the season, and he never gave that spot up. Harris started 15 games for the Chiefs last year. The Chiefs indicated that Harris started over Stephenson because he was playing better. But then the Chiefs kept Stephenson and got rid of Harris. So who knows?