ESPN's Mel Kiper re-graded every team's 2015 NFL draft class recently, and for Dallas Cowboys fans, the re-grade isn't good.

Kiper bumped down his initial "C-plus" grade to a "C" at the conclusion of the season.

The ESPN analyst had several factors when re-grading the team's draft as follows:

I [Kiper] look at first-year impact from the rookie class based on relative value -- contributing to a winner is worth more than piling up reps for a bad team.

I included rookie undrafted free agents added after the draft. (That's part of the process, really.)

Like the rookie rankings, I try to ask whether players who contributed could do so for most teams. Again, relative value matters.

He did say, however, that Byron Jones was one of the team's bright spots.

"Byron Jones was a player I really liked, and he played well for a rookie. He really carries the grade. Randy Gregory is a talent, but I said then they were rolling the dice by taking him that early. They haven't gotten anything from him yet. Still a work in progress. There's nothing to write home about after that, and the team really fell off, with QB health the big culprit. I questioned not taking a running back anywhere, and I still think that's a legitimate concern. I should remind people that La'el Collins doesn't factor in here as he wasn't a part of this draft class, and could have been signed by anybody."

Out of the four teams in the NFC East, the Cowboys got the worst grade of any team. The Washington Redskins got the best grade with an "A." The Philadelphia Eagles and New York Giants both got "C-plus" grades.

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