we never know what the players will do (Glen Coffee), but the coaching staff advises against leaving early if you arent going to be a 1st rounder.
Ingram, Jones and Dareus will grade out as first rounders, however one of them may stay. It is most possible for Julio to increase his draft stock and become the number 1 reciever, this year its between him and AJ Green.
Hightower will not be projected as a first rounder. There is very little value placed on ILB in the draft (the reason Ro was top 10 pick as opposed to a top 5) Linemen, QB's, passrushers, skill players, and DB's are much more valuable. In other words, except for kickers and punters ILB's are the least valuable position to draft, teams would much rather sign one in FA. Combine this with Hightower's less than stellar season, and a noticeable drop off in speed from his injury and Hightower probably needs at least on more year to climb back into the first round.
Barron could surprise us with a jump. Not a lot of picks, but no one throws at him, teams have decided to test the corners and Rob Lester, which have led to Lester leading the SEC in ints.
Interior linemen also do not go very early in the draft, and both Jones and Valachos can do a lot to improve their stock to climb a little or even a lot higher. I don't expect either to consider jumping early.
All this of course is IMHO.