Worked perfectly. I did it exactly as detailed, but I'm wondering why the Decoy on Zeppelin and the Charge on Tonk. Those two steps could have been dispensed with and it should work the same.
eta: Okay, I see now. I tried it again, without Decoy and Charge. Those two rounds gave time for Crouch to fade from Foulclaw. When I omitted them, Crouch was still active and Ion Cannon missed him. I lost. Needs to be done as detailed.