all the quarterbacks that started out poor and got better had much more favorable situations on offense. the Chicago Bears gave their last high contract player 7 offensive coordinators, inferior receivers the first 3 seasons, and J'Marcus Webb and Frank Omiyale. their last trade-up-with-3-first-round-picks quarterback was saddled with a head coach that only permitted him to throw 10 total passes a game and with his successor that was a professional quarterback himself that didn't give a shit about helping him get better.
the one glaring correlation I see here that hasn't been fulfilled yet is that Nagy let Trubisky actually throw the ball, often too much, and that's how he had a 100 QBR or whatever at one point in his life. or in other words, the Chicago Bears aren't the Buffalo Bills. the sooner the whole of CCS acknowledges this, the better.