The strikeouts-plus-walks thing looks like something you see with Class A and Rookie League pitchers with big fastballs, pitchers averaging close to two strikeouts per inning while carrying ERAs of 8.
Marmol probably isn't that far from being unhittable. There have been games in his career when he was just that. Maybe he will never get back the difference between being unhittable and being that kid who get his strikeouts but can't get enough hitters to swing at balls out of the strike zone and miss pitches in the strike zone to hold leads or save games. But I'm sure other teams will be more than willing to give him another chance.