Colts rookie QB Anthony Richardson to undergo season-ending shoulder surgery

Richardson suffered an AC joint sprain in his throwing shoulder during Week 5.
The Colts consulted medical experts and determined surgery was the best option.
Richardson showed promise early in his rookie season before injuries derailed him.
Veteran QB Gardner Minshew will take over as starter for the remainder of the season.
The Colts are prioritizing Richardson's long-term health after dealing with Luck's injury issues.