I would be stunned if we sign another QB around cut time(barring injury to any of our current ones). That doesn't really make much of an impact for a potential #2 or #3 QB.
I think the plan is Darnold or bust. If he sucks or gets injured, we lose games with PJ and Grier and then maybe we get a better shot at our next QB or some other elite prospect.
There is no real good reason to go dumpster diving at QB during the post camp cuts(barring injury to our current ones). You aren't likely to get a guy substantially better and you are also getting getting a guy that has no time in your system.