The OP is typical of people that assume kids come in and play the same from day 1 and it is all play calling. Leidner's development is remarkable. The short passing game did not work before due to Leidner missing a lot of throws. He has clearly gotten better which allowed more expansive play calling. They are not independent, they are related to one another.
Your comment doesn't make any sense. How does he improve, if he isn't given the opportunity to try?
Obviously he has improved over the course of this season, but what's also obvious is that some of the throws he made yesterday were never or rarely ever called during the season. You would think that if he had issues with those types of throws, that the coaches would be smart enough to have him practice them in a real game during the non-conference. Screens, jet sweeps, dump offs, crossing patterns, wide receiver screens, etc... some of those are pretty easy to execute. Will they always be successful? No, but he was never given the chance to try.
What is so hard about a jet sweep? Limegrover didn't use it in a bunch of games, and fans and the media asked him why. He stated something to the effect of that the jet sweep is over played and teams were catching on. But then guess what? He started using it again after that... as if we reminded him that it was in the playbooks.
You are the typical person that thinks a coach is always right, and always knows what they are doing. My thoughts on the coaching staff is this; They want to win with the least amount of mistakes possible, which in my opinion slows down development more than it should. You would think having Mitch practice the passing game more during non-conference would be beneficial to him during conference play, but nope. The coaches just want to play it safe. And sure, they win those easy games... but missed an opportunity to get game action experience to Mitch and the receivers in the passing game.
I also keep going back to the Streveler game, because it's what opened my eyes to what this coaching staff does. Streveler had to play because Mitch was injured, and instead of helping to get Streveler comfortable by giving him a few easy passing plays, they just asked him to run the option all day. And whenever it was third and long, then they asked him to pass... which again, that's setting him up to fail. Streveler had 8 attempts all game (if I remember correctly) and if you go and watch the game over, I'd say only one or two of those weren't on 3rd down. So why not give Streveler some short passes to make him comfortable and give him some confidence? It will also help down the stretch if we ever need Streveler during conference play (which we never did). And the answer is because they didn't trust him.