From PackerPedia
Maybe the Packers espouse the old idea that "young people should be seen and not heard."
Even with a year under his belt, Randall Cobb is still the youngest player on the Packers roster. Coming off of a season where he set the all time franchise rookie record with 1,616 combined yards (which had stood since 1952), it would be reasonable to think that the Packers would want to feature this ascending young player now in his second season.
If they are, they're not letting on.
There has been some speculation recently that the Packers were sandbagging B.J. Coleman, in hopes that if there weren't much film or buzz about him they would be more likely to sneak him on to their practice squad. While we will never really know whether that's true or not, the same case could be made for Randall Cobb and his role in the Packers offense this year.
Cobb is a dynamic playmaker, as evidenced by the fact that he obliterated the aforementioned rookie record previously held by Packers Hall of Fame member Billy Howton by nearly 400 yards. As opposed to Howton, who led the NFL in receiving his rookie season, Cobb's effect was mostly limited to special teams last year. He only touched the ball 27 times on offense, scoring just one touchdown.
Cobb wasn't helped by the fact that there was a lockout last year, so his exposure to the offense was done on the fly. He also is on a team that is stacked at wide receiver, with all four of the veteran players in front of him having at least one 50+ catch season under their belts. The Packers offense was humming last season, so there was little need to make changes during the season to get Cobb more involved.