The fundamental problem I see is clear, and boils down to this :
People want to see RG3 as a developing and progressing QB, with unlimited potential
But they refuse to afford McCoy that same freedom, and right, and potential.
You cannot talk about 2 QB's who have been in the league about the same amount of time, and insist that one has hit his "talent cap" and will never, ever get better - while the other QB is "bound to get much better".
And what adds to the irony, is that if either of them seems to be progressing in his "talent cap", the facts and evidence show that it's McCoy, and not Griffin.
Not only that, but you could make the same case for Cousins vs Griffin.
Cousins has had less time to develop, than any of the 3, yet people are already giving him the "career back-up" stamp, just like McCoy.
Yet, Cousins' apparent flaws, seem to be much more manageable and correctable than RG3's numerous and fundamental flaws.