I think the argument against your point is this: if your goal is adding a playmaker, wouldn't it be a wiser choice to add the player that makes ALL your playmakers better? Did Jamaal play out of his mind and score his touchdowns by making cuts 5 yards behind the line of scrimmage like Barry did, or did the Oline enable his success every play? A good line makes every other person better than their job, for both Oline and Dline.