GratefulPack posted:88 was forced into a RB position when Lacy and all others went out. Before that, MM was using Cobb out of the backfield to force mismatches, but from my recollection, Cobb never posed much of a threat as a runner so teams didn't adjust as MM would have liked. 88 was not a bad runner and seemed to have potential but the bulk he eventually added seemed to slow him down a bit. I always though 88 never reached his potential under MM and might have been more successful under a different coach, but it seems he hasn't done anything post-Packer so maybe the Packers got all he had out of him.
MM prioritized RB blitz pickup ability above anything else. That's why we put John Kuhn as a single back on the field on passing downs for years. We all loved him, but he was no threat to the defense to run or catch a ball out of the backfield - unless he was left wide open. Sometimes if worked beautifully (like when he blocked Peppers to allow Rodgers to throw the TD pass to Cobb against the Bears to get into the playoffs a few years ago). Most of the time, it made them entirely predictable and set up a situation where the defense could scheme to stop designed plays and then Rodgers reverted to sandlot football and bailed them out. Having a good blocking RB on the field helped extend those plays, but it was all freelance.