the summary paragraph clearly expresses their opinion :
while they may have made some statistical points in their story, the true measure of a QB is beyond that which can be charted on a stat sheet ... those hard to define, but you know it when you see it, intangibles ... and I think Mr. Trubisky has that ... and unlike PFF, I believe he is smart enough and coachable enough to understand where he needs to improve as a player and will take measures to do soSo, while it’s true the Bears have one of the best rosters in the NFL, with a head coach who appears to be one of the best young offensive minds in the game, we’re very skeptical of Trubisky as a passer in 2019. While it’s possible (likely?) that he makes process-level improvements, namely that he’s more accurate and avoids negatively-graded plays more frequently, it’s probably unlikely that they will be enough in and of themselves to overcome the statistical regression that his data begs. Add in the likelihood that the Bears are not the clear-cut best defense in the NFL in 2019 and things will just be harder for Chicago and their young quarterback. Don’t say we didn’t warn you.
so be skeptical all you want PFF, the Bears, with Trubisky leading the offense, WILL improve ... so