The QB decision maybe issue #3 in terms of importance, but it is #1 on the list of immediately fixable things that could have the greatest impact on our program.
The oline is the biggest problem, but we won't solve that problem any time soon. In the meantime, we need to adjust what we can to neutralize problems with the oline.
Casey does a couple of things well in this regard. First, from everything we've seen, he's faster at finding an open receiver, and when he sees the separation, he pulls the trigger quick. Second, if nothing is open, he's decisive about getting north/south for whatever yards he can. Those QB traits are critical if the line is weak.
We had a bad oline when Colt was playing, but he was so fast getting rid of the ball and so good on his feet that the line problems did not cost us games. Casey is a very different player from Colt, but I see how he could cover up oline problems similar to how Colt did.
Also, as we saw Saturday, we have a good defense at first but one that wears out if our offense cannot sustain drives. If Casey can sustain drives, he'll help us not only on offense but also on defense (by giving them a rest). So this could be a significant improvement. Definitely worth trying.