June didn't leave behind a good roster, but he did leave behind a handful of players good enough to be starters...
Offense - Sutton, Davis, Gaines, and all 5 starting linemen are Jones recruits.
Defense - Lawler, Horton, Gentry, Minor, Rhone, Jackson, H Richardson, Wyatt, DM are all Jones recruits.
Vast majority of skill positions on O and D are Chad, all the depth on both sides of the line are chad (and we can all agree that they are just backups because they are young and not ready yet).
Chad has done a great job of reconstructing the roster and, frankly, getting more out of the starters above than June would have gotten (Sutton might still be at safety

). But some of our better players this year will still be June recruits.
As far as transition on defense, I think we all expected M Scott to blow by Horton, but I think M Scott is a 3rd down/pass rush guy this year unless he improves significantly over the next 3 weeks. Minor will keep his place until he gets hurt, which from past experience may happen in the first quarter of the first game

, I didn't see anyone ready to push Rhone or Jackson (it is what it is). Look for frosh at the Star/3rd LB position, K Mitchel is the other June recruit that was penciled in before camp but I don't think he wins his spot back when he gets healthy. The secondary guys look great, I don't think they are going anywhere. Being in a valid weight program has done wonders for them. K Johnson is absolutely amazing at the other safety spot, his quickness to the ball is awesome.
The reason this team is going to be better this year is Chad and Chad's recruits. But don't completely dismiss the fact that the majority of starters on both sides of the ball are still going to be June's players.