Two months into their careers, though, Gurley and Cooper are already among the best at their respective positions.
Cooper is the rare receiver with explosiveness after the catch as well as downfield tracking ability. How impressive has he been? NFL Media analyst Daniel Jeremiah said this week that he would take Cooper over Beckham, due to the rookie's durability edge.
Cooper and Gurley have separated from the pack, turning Offensive Rookie of the Year into a two-man race.
Those two aren't the only greenhorns impressing, however. Here is Around The NFL's latest Rookie of the Year watch for Week 8:
1. Todd Gurley, St. Louis Rams running back: Since entering the starting lineup three weeks ago, Gurley has accounted for 50 percent of the Rams' offensive yards. He's easily the youngest player in NFL history to run for at least 125 yards in three consecutive games. As NFL Media's Brian Baldinger put it this week, "My mom could scout Todd Gurley."
2. Amari Cooper, Oakland Raiders wide receiver: Cooper is the first rookie since Mike Ditka in 1961 with three 100-yard performances in his first six career games. Among receivers with at least 25 targets, he ranks first in yards after contact (302) and yards after contact per reception (9.2), per Pro Football Focus.
4. Leonard Williams, New York Jets defensive end: Williams played 70 percent of the snaps versus the Patriots last week. When coach Todd Bowles turned to a four-man front in Week 6, it was natural to believe it could have been a game-plan specific approach against the run-oriented Redskins. It's telling that the Jets kept the 4-3 look versus a Patriots offense that ditched the run altogether.
6. Jameis Winston, Tampa Bay Buccaneers quarterback: If not for Kirk Cousins' dramatic comeback victory, we would all be raving about Winston's breakout performance versus the Redskins. The list of quarterbacks with a higher yards per attempt than Winston's 8.1 reads like an MVP contest: Andy Dalton, Carson Palmer, Tom Brady, Aaron Rodgers and Russell Wilson.
10. Jordan Hicks, Philadelphia Eagles linebacker: Chip Kelly's offseason machinations have backfired with Sam Bradford, DeMarco Murray and Byron Maxwell failing to meet expectations. His first two draft picks -- Nelson Agholor and Eric Rowe -- have also disappointed. Hicks and Ryan Mathews are the bright spots.