When was the last season Schottenheimer coached? 2006? Hardly an active coach. As I remember it, Merriman left the game he was injured in and had press conferences in which he downplayed doctor opinions on his knee as well as the threat to his career. If RG3 wanted to start in the wildcard, that's on him. He was quite clearly, reinjured in that game. Letting him play on while the Seahawk defense contained but wouldn't hit him on a scramble because he was obviously injured, is another. Shanahan must not have been paying attention to the game on the field?
Let's not pretend letting a LB try to wreck his career when he went to the media and told everyone he was going against doctor recommendations and didn't care, is different then not taking your QB out of a game and throwing in a backup while he is examined so you can decide whether or not he plays on. One of them was a roided up role player, the other is literally the fate of your franchise you just spent 3 first round picks for.