Last season, Justin Thomas took it upon himself to work in the offseason with the Wide Receivers and Running Backs on their "ball catching" skills and mesh/handoffs, and from everything I've read, he's doing the same thing this year.
Working on timing patterns, the speed of the pass getting to the recivers, the feel of the pass, etc., in repetion was key last season im my opinion, and will pay dividends. Also, working with the "mesh" with the new B-Back(s), and timing with the A-Backs, will also help come game-time.
We all know we had several injuries on the O-Line this Spring, so we really don't what it will look like this coming Fall. What we DO know is that it closed out 2014 dominant, and we only lost Shaq Mason, so finding his replacement, regardless of whether we move one of the other starters to his position and backfill to THEIR position, or whatever happens, if our line plays as physical from the start in 2015 as they ended up in 2014, then Justin will have a world of options with the ball in his hand from the first snap, and we all know how dangerous he is in that position.
Hopefully Jabari will get his classes in order so he'll be eligible next Fall, and if this is the case, suddenly, our D-Line could become one of the strengths of the defense instead of the weak link, like last season. The D-Backs look to be the best we've had in years, so the only potential question mark will the the LB corps, outside of Paul Davis, who is a machine. However, if our D-Line and DB's can be stellar, this could mean Ted Roof will feel more comfortable getting even more aggressive with his play calling, including blitzes, etc., which should take pressure off of the LB's staying close to a player or position for extended periods.