I think third down situations would be the best time to use a spy on him. I'd go with either Johnson or Gaines.
With the issues we already have in coverage, I wouldn't take another guy out of the scheme. Keep him in the pocket with a controlled rush, maintain gap discipline, and do what Oklahoma did last year; make him beat you with his arm.
I would put in the GT defensive philosophy. I really hope we control the run game as well as we did this week. If we were to spy him I agree with using EJ. You need to keep the best defender in the middle of the field.
DO we assign a linebacker to spy Kline next week ? If so what scheme would be best around that on defense ?