Re: If VI had featured Saavik instead of Valeris as the traitor
Chekov as a co-conspirator? No motivation except for the false Piotr memory. Janice Rand would have been a logical choice, getting back at Kirk for kicking her off the ship all those years ago. And because he tried to do the nasty with her without consent.
Dr. Howard, Dr. Fine, Dr. Howard: For Duty and Humanity!
--Men in Black, 1934.