Spring football is coming to a close in the Big 12, with several players making a move in their respective programs and securing or improving their roles on the team. We reviewed the Big 12’s stars of the spring by taking a closer look at their pre-spring roles, spring performance and potential roles this fall. The two-day review began with Part 1 on Thursday.

Running back/receiver Tyreek Hill, Oklahoma State

Pre-spring role: While it was unclear what role Hill would play in the Cowboys’ offensive attack, one thing was certain: He had elite track speed.

What he did this spring: Hill showed he can do a variety of different things in Oklahoma State's system, from taking straight handoffs as a running back to making plays on the perimeter as a receiver. He showed he doesn’t just have speed, he has big-play ability and the potential to change games in one play this fall.

What his role could be this fall: Ideally, Hill will take on a Tavon Austin or Percy Harvin-type role for the Cowboys, with Oklahoma State using him in a variety of ways to take advantage of the weakness of the defense they’re facing that weekend. Hill should be one of the main threats in the Oklahoma State offense in 2014.

Quotable: “He has, obviously, that God-given speed that we all see, but he also has a hunger deep inside. You don’t know about that until you get to know somebody and get around them and get 15 practices in. It’s good to see his hunger and drive inside.” - Oklahoma State offensive coordinator Mike Yurcich

Receiver Marcus Johnson, Texas

Pre-spring role: Johnson was expected to be one of several receivers competing to replace Mike Davis as a main target in Texas' offense after recording 22 receptions for 350 yards and two touchdowns as a sophomore.

What he did this spring: Johnson had a terrific spring, showing he has the ability to make plays during scrimmages and competitive spring drills. The junior has the speed to test defenses and showed it during his first opportunity to impress Charlie Strong and the new coaching staff.

What his role could be this fall: Johnson could end up being the man to replace Davis alongside Jaxon Shipley. The Longhorns need a No. 2 receiver to emerge, and Johnson could be the guy if he becomes more consistent on a weekly basis.

Quotable: “Marcus is a big-play player. I mean, he has got great speed, he is assignment-sound, he has played a lot of football, so he has got a real good feel for the game. He is a great fit in what we do and he has had a great spring for us. He has played really well.” - Texas offensive coordinator Shawn Watson

Safety Kenny Iloka, TCU

Pre-spring role: A newcomer who arrived from the junior college ranks during January, Iloka was signed to provide depth and versatility in TCU’s secondary.

What he did this spring: Iloka staked his claim to a role in TCU’s defense despite several experienced safeties returning, including Sam Carter. Iloka, the younger brother of Cincinnati Bengals safety George Iloka, stepped on campus as a ready-made impact player with his willingness to set a physical tone in the secondary.

What his role could be this fall: TCU returned three safeties who started games in 2013, but Iloka looks like he will make an immediate impact, even if he doesn’t force his way into the starting lineup.

Quotable: “Kenny had a heck of a spring; he really adds to the depth. He’s going to be an exceptional safety for us.” - TCU defensive coordinator Dick Bumpus

Receiver Jakeem Grant, Texas Tech

Pre-spring role: Grant was a playmaker for Texas Tech during his sophomore season, but the Red Raiders are searching for a even bigger impact from the junior in 2014.

What he did this spring: Grant looks ready to handle being the focus of an opposing defense. His speed and quickness are a handful, but he’s starting to develop into a legitimate receiving threat as opposed to a change-of-pace kind of offensive weapon.

What his role could be this fall: Grant, if he continues developing, could become one of the Big 12’s top receivers and the centerpiece of the Red Raiders' offense, replacing Jace Amaro as a matchup nightmare for Big 12 defenses.

Quotable: “He made some big plays last year, but really had a big spring for us. He’s developed on and off the field and, academically, he’s much improved. On the field, his consistency as a receiver and his work ethic is night and day from last year.” - Texas Tech head coach Kliff Kingsbury.

Running back Dustin Garrison, West Virginia

Pre-spring role: Garrison was a relative afterthought at the position with Andrew Buie’s return and the addition of Rushel Shell.

What he did this spring: Garrison reminded people that he led the Mountaineers in rushing in 2011 with a strong spring showing. Injuries hampered his production during the past two seasons, but his direct running style and competitive nature was on full display through during the 15 spring practices.

What his role could be this fall: He might have earned himself some carries this fall even though West Virginia goes four or five deep at running back. His emergence could allow West Virginia to get creative with its use of sophomore Wendall Smallwood.

Quotable: "I thought Garrison had a really good scrimmage. He showed up. He was a guy that stuck out." WVU offensive coordinator Shannon Dawson told The Charleston Gazette after a two-touchdown performance by Garrison in a spring scrimmage.