FAYETTEVILLE, Ark. — The Arkansas Razorbacks closed spring practice healthy, organized and ready to hit the ground running for Ryan Silverfield's first season. While there wasn't as much offense as most traditional spring games display, Arkansas did show enough fight, discipline and execution in nearly all facets of the game. With a full summer to go until fall practice begins, there's still some things everyone knows, yet, still plenty of questions. Here's three to keep an eye on this offseason. Arkansas Razorbacks defensive lineman Quincy Rhodes and coach Ryan Silverfield. | Ted McClenning-allHOGS Images What Is Known: Defense Looks Improved It's been a while since Arkansas has fielded an above average defense, and it's mostly because of a lack of depth at every level. When Silverfield brought in Ron Roberts, he completely gutted a unit that was among the worst in the country in all facets of the game.…