Will the Packers offense not looking quite right, and blame going to both players and coaches I have wondered how much do the Packers miss former WR coach Jimmy Robinson. Robinson was with the Packers from 2006 to 2010 and helped develop Jennings, Jones and Nelson among others.
And no one really has developed that much since... yes Cobb has been huge at times, but he had a lot of skills and talent from before day 1 as a Packers... and he just needed to adjust to a new team, culture and being in the pros level.
Robinson was expected to retire from coaching in 2010, but due to one of his best friends (Jason Garrett) getting a head coaching job and needing a WR coach, he went to coach the Cowboys WRs a little bit before later transitioned to the role of coaching consultant in 2013.
Just a random thought...