Mary Langenfeld-USA TODAY Sports
Despite a lot of youth on the offensive side of the ball, Allen Robinson's decision on whether to stay in Happy Valley or enter the 2013 NFL draft is huge. Robinson accounted for roughly 66 percent of Penn State's receiving yards from wide receivers this season. He had 1,198 more receiving yards than Geno Lewis, the most productive of Penn State's wideouts who return in 2014.
Robinson's potential departure would be a huge blow, but Christian Hackenberg will still have some weapons at his disposal. Running backs Zach Zwinak and Bill Belton will return, while Kyle Carter and Jesse James will headline an impressive group of tight ends.
The offensive line will have to replace three starters in 2014, but Penn State is fortunate to have cornerstone left tackle Donovan Smith and offensive guard Miles Dieffenbach both coming back.
On the defensive side, Penn State will have to replace the likes of defensive tackle DaQuan Jones and linebacker Glenn Carson. Those will be tough holes to fill, but the Nittany Lions are fortunate to have back some other key pieces.
They'll return Adrian Amos and Jordan Lucas in the secondary, as well as Mike Hull and Brandon Bell in the linebacking corps. Lucas and Bell were two of the younger players who stepped up throughout the course of the year, and their futures are bright.
On the defensive line, defensive end Deion Barnes will likely return despite having the potential to head to the draft. He'll be joined by defensive ends C.J. Olaniyan and Anthony Zettel, who could end up moving inside to combat the loss of Jones.