Do you really think that a guy who has demonstrated ability to accept coaching, is willing to work hard, proven his willingness to study film and comprehend it. All of this proven by by his Belichick awarded Parking Space is incapable of improvement?
He has demonstrated if you weren't noticing, a repeated ability to move a team on extended marches, and complete the intermediate and long pass in exemplary fashion.
Do you seriously think he is NOT CAPABLE of perfecting the short, dump off, pass?
The reality is that there are multiple things being coached while doing so, and the coaching objectives of each conflict partially with the other.
He is being coached to narrow the target of the short pass to low throws. That is for the purpose of reducing INTs and keeping his receivers healthy. A tertiary reason is to make YAC more possible.
A conflicting coaching effort is simultaneously going on, to control the strength of his short throws, to 'modulate' his throwing effort, to make these passes more catchable. This involves learning to take some steam off his natural throwing effort.
I find it entirely understandable that these conflicting goals, had led to a tendency for some throws being too low and short.
But seeing as how he has:
a) Accepted coaching;
b) Improved his footwork immeasurebly;
c Is reading Defenses in real time;
d) Is doing so at acceptable NFL speed;
e) Is selecting the proper receiver, most of the time;
f) revealing that he comprehends and understands what he sees;
g) has had but a very limited body of game action to improve.
I think the Polish & Poise, is coming along very well. When he goes under Center, he no longer appears to be a raw rookie QB.
Despite the short low throws, his completion percentage is in the high 50% range; with an additional acknowledgement of his ability for the long ball. It is already enough to move the ball consistently, as several QBs in the league make a career of doing.
What were the Prime Considerations that led to his dropping from a Top Ten selection to Round Three, where he fell into Belichicks hands ?
No one could criticize his Arm or physical size. It was intimated by anonymous rumor, that he was an immature, AND a stupid, country hick, who was lazy. He couldn't and wouldn't study at his craft, and could never comprehend what he saw on film.
His actions with Bill Belichick proven by the Parking Award, have proven all those criticisms wrong, save the immaturity question. But Father Time is curing that.
Don't you think given time he can resolve those conflicting coaching goals, and consistently modulate his short dump off throws, and also correct his aim to slightly higher target zone ? Perfecting a dump off pass is after all a school yard accomplishment.