National Signing Day is almost upon us, but a number of SEC schools are already at work developing members of their 2015 recruiting classes.

Nearly every program in the conference enjoyed a handful of early enrollees at the start of the month, and those players should have a leg up on their fellow members of the 2015 recruiting class. Early enrollees are able to participate in spring practice this semester, and they’ll have the chance to build a rapport with teammates and coaches in addition to mastering the playbook before the start of fall camp.

This got us thinking:

Which SEC early enrollee will have the biggest impact on his team as a true freshman in 2015?

We asked our SDS staffers this very question. Take a look at what they had to say:

Jon Cooper (@JonSDS): Alvin Kamara, Tennessee

The Alvin Kamara show is about to start in Knoxville. The five-star JUCO transfer is ready to make an impact in year one, and the Kamara-Jalen Hurd combo should get Tennessee fans excited. Obviously, Tennessee’s offensive line has to improve before next season, but the backfield will be as strong as anyone in the country. Watch for Kamara to have an immediate impact for the Volunteers.

Brad Crawford (@BCrawfordSDS): Sherrod Pittman, South Carolina

Four-star linebacker Sherrod Pittman should be able to instantly compete for playing time at the Gamecocks’ most solid position group on defense alongside returning starters Jonathan Walton and Skai Moore. Kaiwan Lewis, a tackler who saw a ton of reps during the 2013 campaign, recently transferred after losing his starting position last season. That’s a hole South Carolina needs to fill and Pittman’s the perfect option. At 6-foot, nearly 230 pounds, Pittman gives Lorenzo Ward’s defense a physical presence in the front seven much like Walton.

Christopher Smith (@CSmithSDS): Kyle Phillips, Tennessee

The greatest impact among early enrollees will come from junior college transfers like Jovon Robinson, Alvin Kamara and potentially Chad Kelly. But if we’re talking strictly true freshmen, Phillips has a good chance. Part of Butch Jones’ strategy has been to leverage as much as he can out of early enrollees. It’s going to get much tougher for true freshman to find major roles with the Vols starting in 2016, but Phillips could follow Derek Barnett either as the stater opposite him or as part of a rotation with Corey Vereen. Either way, expect Phillips to make an impact as a pass rusher in 2015, especially with defenses distracted by Barnett and Curt Maggitt.

Brett Weisband (@WeisbandSDS): Kevin Toliver, LSU

Defensive Back U has a few spots to fill in 2015, and Toliver will be more than ready to grab a seat in the starting lineup as a true freshman. With Jalen Collins heading to the NFL and Rashard Robinson no longer a part of the team, LSU returns just one cornerback, Tre’Davious White, with significant playing experience. At 6-foot-2 and 185 pounds, Toliver already has the size and athleticism to compete in the SEC. The nation’s No. 2 cornerback getting to campus a semester early will get him mentally ready to step into a starting role on a talented defense.