I dunno, 25 games to figure out when to check to an open receiver down field? I don't know your definition of "grown dramatically..."
Obviously you're just trolling but for shits and giggles lets go ahead and follow your logic down the beaten path to see where we arrive. Do you remember who was the head coach last season? Do you remember the stone age offense Trubisky ran last season? Do you remember that he was barely given the opportunity to pass the ball? Apparently your answer to all of the above must be no because you somehow believe he would have, or could have for that matter, learned last season how to do this. Nothing can be further from the truth. There were very few things that Fox managed to do right in terms of Trubisky's development. Those of which had to do with mechanics and forcing him to learn how to be a drop back passer.
Nagy himself has said that he had to remold Mitch's mentality on how he approached, processed and attacked defenses. All of which are mental aspects of the game. There was nothing cerebral about Bilbo Loggains' offense or John Fox's coaching. Yet you, by some logic I can't comprehend, actually seem to think he could have learned this aspect of the game from those shitheads. You're grossly underestimating how much Mitch has learned, absorbed and progressed in 13 fucking games. Under a new complex offense no less.
TL;DR onebud is right, you're wrong
