More so back in the Spring, honestly, when they had him playing more at LG. I know he is getting more OT work recently. I think Coach Justice mentioned him a few weeks ago and said he was a guy who could play all 4 spot at OG and OT.
Don't forget about the potential of Rivers at RT. Some are penciling him in as a guard, and I understand the staff is trying to get him some work there early, but he has the footwork, length, and athleticism to be a great college RT.