I dont disagree about darnold but totally disagree with you about corral. Thats how players get better, you know by practicing and playing. He had like 2 really really bad throws last night and a few more off the mark. He needs a ton more work and he will not get that on the IR or being 4rth string.
Play Baker a few series next week, roll SD for a few and then just give the rest to MC.
Thats of course if he is not seriously injured