Not quite. Darnold could do himself a lot of good in the QB battle by having a big game on Thursday night, but it's going to take more than one more strong preseason game for him to lock down the Week 1 job. Odds are he needs to light it up against the Redskins, then keep it going next week against the Giants.
On the flip side, if Darnold comes out and has a stinker against the Redskins, he's still not necessarily out of the race. As important as Thursday night is for Darnold, the third preseason game is always the most vital.