I think the only reason Gray is playing at all is Brewster promised Gray he would play as a freshman. Remember Gray was very highly recruited and Brew need to do something to reel this guy in. Brew has often said how important early playing time is to young recruits so... Brew says I'll guarantee you will get playing time as a frosh - not that you will start but you will get game time - after that it is up to you. Brew is just keeping his word and Gray, according to the Pioneer Press at least, isn't upset by not getting more snaps. That tells me Gray isn't doing that well in practice and he knows it. Look at it this way - if Gray were tearing things up in practice he, and many of his teammates, would be the ones pushing for more playing time. That doesn't seem to be happening. If Gray were really outstanding in practice I don't think you could keep it secret.
Just my best guess - no inside information
Just my best guess - no inside information