Hm, well, I would say JG still is struggling, but did actually improve a bit from Ga State, in which he was truly wretched. Still not near enough, I agree, but that's a nit.
My main point would be I am not sure I would throw Maurer to the Dawgs just yet (literally). Let JG start, then when he struggles bring Maurer in and see if he does better. That's a great way to compare the two. If Mauer shows a big advantage over JG against the same D, then start him against MSU. If not, keep that system going until one or the other shows as being better at least through bammer.
Let's face it, we have little to no chance against bammer and uga. MSU we do, thus the chance for Maurer to start. But if I'm Pruitt, I am looking to the winnable games, those being MSU and most of our November schedule, and would want Maurer to face that slate and not bammer and uga.