I'm pretty much in agreement with fansince's take on this.
The question in my mind right now is the knee. What I'm seeing is a deterioration of Griff's mobility caused by both the knee and the knee brace inhibiting his ability to be as mobile as he was last season. His passing mechanics are such that his accuracy is mobility-dependent as fansince suggests. He has become accustomed to throwing on the run-moving out of the pocket, quick plant and quick flick of the wrist throw.
This is muscle memory operating-instinctive, requiring virtually no conscious decision making once the choice to move as been made. This is completely different from the approach a typical drop-back pocket passer uses. Griff's functional auto-pilot mode is synchronized to his mobility and athleticism. IMO, an attempt to convert him into a typical drop-back pocket passer would be a difficult and time consuming process because of things he would have to unlearn and replace with a different set of brain-muscle interactions which would then have to be repeated often enough for them to be non-conscious-level muscle memory in order for them to be as effective as his normal (and healthy!) mode of operation is now.
What I need to find out-which may be difficult, especially in an ongoing season is this;
How well would the unbraced knee function in a live-fire game situation? The brace certainly appears to be a notable hindrance to his mobility for both passing and using him as a viable run threat. I attribute pretty much all his passing difficulties and unusual accuracy problems to changes he has had to make because of the knee's immobility-be it internal, the brace, or a combination of both. Is it being used as insurance or is the knee still lacking structural integrity sufficient for him to use his mobility to return to his more accustomed passing mechanics and running?
Or am I wrong and the brace really not that much of a hindrance and it's just caution on the coaching staff's part-with the added possibility of some fear on his part that is causing play-calling and his on-field decision making to place him in a position in which his strengths are apparently unavailable in a situation were they would be seriously useful?
Frankly, I'm worried. The Redskins running game-even with the skills of Almo and Helu, still largely dependent on Griff's mobility and athleticism to be as dominatingly effective as it was last season. Opposing defenses right now can shed the uncertainty we gave them last season and attack either the run game or go after Griff with relative impunity when last season they would have paid for the choice heavily with a strong running game or a quick pass from a mobile accurate QB. Putting defenses in a "damned if you're right, damned if you're wrong" situation was our weapon last season. Currently that weapon doesn't seem available. I hope I see something that shows I've made a mistake somewhere in my analysis.