TB3 touched on something here that needs to be expounded on a little.
You see a lot of fans talk about the spring game as "another scrimmage" and therefore you can't take a lot away from it in terms of how the team will look in the fall. A lot of that is true.
Skel drills fall lower on that "rating poll" than the spring scrimmages. There are a few things you can see in skel drills and come away with solid observations. For instance, Jerrell doing well with pass coverage. How he'll do against the run can't really be judged until you have 11 on 11.
I love watching skel drills on any level. You can see how athletic a kid is...can see potential, and can see what might be a problem. With Julio, when our DB's have pressed him along the line he's struggled. When they have given him the opportunity (as in a 5-8 yard cushion) he's done pretty well. He's making plays just like Maze has been...just like others have been. But, he's not "all world" by any means at this point. He definitely wants to improve and wants to get the timing aspects between the WR position and QB position down to the point when fall camp begins he'll be able to contribute.
All that said, I still don't see him as a starter against Clemson. Then again, if we line up on the first play in a 4-wide set and he's one of the four does that really make him a starter? Not in my eyes. With the WR position it's all about making it into the 6-8 player rotation and you'll have the ability to contribute. Just as another example of the "starter" role. Nick Walker is considered to be the "guy" in our TE role. If we line up in our Ace set with an H-back on the first play (let's say with Preston Dial) does that make McCall, Dial and Walker starters? What if we line up in a no-back set? Does that mean Grant isn't a starter?
Bottom line to what/how I see it. The term "starter" is subjective and doesn't carry a lot of weight. Having the ability to contribute and contributing is what is important. Jones has that by all indications.
FWIW, the comments on how Julio is doing came from a player participating in the skel drills.