I guess my reading of this article is different than most everyone else's.
My take was that they didn't want to expose Gray to too much pressure early in his career and risk damaging his confidence and future viability as a play maker. It's not that he has no grasp of the offense; rather, his level of understanding is such that making the appropriate decisions and reads might not come as naturally to him as they will after a year in the offense. Thus, rather than sending him out to make mistakes and negatively affect his future potential, they're protecting him for this year, getting him involved where it makes sense and letting him naturally develop.
Certainly, the reading you all are giving the article makes sense: "he clearly doesn't get it or else he'd have found himself playing more of a role in the offense, and the article supports that line of thinking." Is it possible, though, that Brew is taking a longer-term approach to Gray and some of the other young talent (Hageman, etc.) and not getting them on the field until they're absolutely ready to play? Or do you all think the leash Maturi has him on is too short for that approach?