Well, history is littered with guys who suddenly lost their command and never regained it, but those guys typically lost the zone entirely and walked the park. Lester is missing everything by about 6 inches into the zone. He'd be better off if he was wild and walking people since he'd then at least not be as predictable. Also, something he has entirely lost is his ability to come inside. When a hitter knows he'll be extending his arms on almost a pitch by pitch basis, it makes for a very comfortable at bat.