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It seems most NFL Draft classes have one player who was selected in the later round (Rounds 4-7) who somehow or another makes a large impact on the team. Some call these players "Sleeper Picks" as to the nature of someone possibly sleeping on them and their ability to help the team. The Pittsburgh Steelers are no strangers to these types of picks. Think Martavis Bryant in 2014, Vince Williams in 2013, Kelvin Beachum in 2012 or Antonio Brown in 2010.
So, who might be the sleeper draft pick in the 2015 group? My money would be on defensive tackle Leterrius Walton. The reasoning behind it is two-fold. First, the position he plays is extremely thin in terms of depth. Defensive tackle is a critical position in the 3-4 defensive scheme, and outside of Stephon Tuitt and Cameron Heyward, the team is look at Clifton Geathers and Cam Thomas as their primary backups. Walton is brimming with potential and was projected to be a 5th round draft pick who fell to the Steelers in the 6th round.
The second reason for thinking Walton will be the man people remember would be his versatility. Walton is athletic, and although his technique will need some tweaking, his size and athleticism make him an extremely attractive prospect to be able to fill the role of depth along the defensive front.
The Steelers like to deploy a rotation with their defensive tackles, and although Thomas proved to fill that role in 2014, there is no guarantee the team won't give every willing body a chance to fill that role in 2015. Obviously players like Bud Dupree and Senquez Golson will have plenty of pressure on them to perform when given the chance as a rookie, but for Walton being selected in the 6th round can often lead to being overlooked.
On Walton's NFL.com Draft Profile, an AFC West scout put it best in regards to the potential surrounding Walton:
"I have a feeling he's going to be one of those guys who ends up being an NFL player that nobody sees coming. He was a baseball and basketball player, which means he has good hands and feet. More coaching might be able to unlock an NFL player."