Then, on Thursday the 25-year-old exploded.
Not only did Moore likely secure a roster spot -- he did it in emphatic fashion, catching three passes for 58 yards and two scores.
Those three catches weren't run-of-the-mill, either. The first was a beautiful adjustment and snag on a back-shoulder throw that set up a touchdown. On the second he displayed speed, blowing by a defensive back for a 36-yard touchdown. The final catch was another back-shoulder catch and tip-toe for an 11-yard score.
Perhaps the most telling part of Moore's performance was his obvious chemistry with the rookie quarterback.
"D-Mo's a good receiver," Carr said after the game, per the team's official website. "He's obviously fast. He ran that go-route right by that guy. He's someone that I trust and someone that I feel good going to."
The fourth-year receiver hasn't displayed the consistency the Raiders need from a player the team once viewed as a No. 1 receiver -- hence his chopping-block status.