RGIII later confirmed to reporters at his news conference that "coach decided to shut me down for the rest of the season."
Griffin has struggled this season coming off ACL surgery, but he hasn't missed time due to the injury. Some regression should have been expected from his excellent rookie season, given that he has yet to have a full NFL offseason. However, RGIII has been far from the only problem with the Redskins; he's just the highest profile disappointment.
Shanahan mentioned Monday that if a change was made, it would be for the rest of the season.
In the middle of this mess sits Cousins, who performed well in relief of RGIII last season. The 2012 fourth-round draft pick should get three games to audition for other teams.