I thought it was quite evident that R.G. III agravated his existing knee injury on the play before the Redskins second touchdown. He obviously couldn't put his full weight on the one leg and it was clearly affecting his ability to throw.
Cousins isn't awful by any means. I think if he would have been put in while the Skins still had the lead they would have had a much better chance to win that game.
Anyway I have to laugh at all the NFL talking heads circling the wagons to protect Shanahan. The only one I've heard with the balls to question his decision was Brian Billick, who pointed out there's a difference between playing hurt and being too injured to perform effectively.
Of course no one ever wants to go on record and criticize a coach. But to me if you're ever going to give credit to a coach then they must also be willing to lay blame when it's due.