Yes, they need Parris Campbell.
I would go along with the OL and another RB. I'm not sold on Jones being a bell cow. A TE that can press the seam would help too.
This whole thing has been a "Triple Failure". TT for letting the talent level on offense get very thin. MM for running concepts that lack creativity and not consistently matching your best players in favorable positions. Rodgers for letting it all get to him and not handling it like the highest paid player in the league and veteran leader.
I'm convinced we need to get Josh Mcdaniels in here. He has shown over and over he knows how to match guys up and if he can handle Brady he can handle Rodgers. Mcdaniels will find something that works and puts the peddle down on it untill the defense can prove they can stop it. Then he adjusts approximately. MM way too many times took his foot off the gas.