I was listening to the Chris Treese's podcast and I've linked the 2nd hour of the 4/9/14 show below. I think Chris has been at all but 2 practices. Anyway, what they pointed out in their view was that a significant difference between Justin and Riley is Justin's ability to read his keys in the zone read. They say Justin has improved greatly and is keeping the ball if the defense is giving him the edge but he also knows when to give the ball up. Riley, on the other hand, is either having difficulty reading his keys or is unwilling to give the ball up. They say Riley is running too much and being a tough kid he isn't shy about taking a hit. Consequently, he's getting banged up a bit. They both said that Riley should be giving the ball to Jalen on the read at times he instead is keeping it himself. They also talk a lot about the improvement in Justin's passing game. If you listen, the segment kicks off with a questioner starting at 22:30 and runs for 6 minutes.
(The entire show is full of player evaluations if you're interested. I just skip through the commercials. Elsewhere in the show they are really high on the defensive front, worried about the safeties but everything else is good. They think the problem on the OLine is partly due to having Vereen & Maggitt to deal with and Vereen is blowing up who ever is put in front of him whether it's Blair or Gilliam, don't matter to him. Thomas is getting blown up as well. They expect the tackle situation to come along between now and the fall but the strength of our line will still be the inside guys. Ultimately they suggest that Vereen & Maggitt are going to be difficult for anyone to slow down. In fact they say that the entire defensive front is much faster than it was last year. They talk about Moseley a lot and Owen Williams, among others. They also say Coleman has improved a lot since last year.)
I should note that I am and have been one of the founding members of the #FreeRiley club and that ain't going to change until he goes full Peterman on us (

) but this was a different view I thought on the status of the QB competition and coming from a former player who spends a lot of time at practice. TIFWIW.