Because you don’t want to give up a huge chunk play early that allows the opposing team to run the clock down to the point that if they score a TD you have no chance.
Worst case scenario is they kick a missable field goal.
I think you have to let this season play out. But the defense was heavily depleted and we will likely need to use our top pick there.
If Dalton looks good you bring in another vet QB to compete.
If he sucks you bring in a vet and draft another.