At the end of ST2, Kirk was optimistic about recovering the marooned Reliant crew. One'd think Chekov would already have informed him if his optimism was misplaced...
OTOH, the L.A.Graf novel War Dragons claims that the entire Reliant crew died, either directly during the takeover or during the few days they spent on Ceti Alpha V. Doesn't fit with ST2, but does make sense otherwise. Perhaps Khan told his victims he was marooning them in harsh but survivable conditions, but instead killed them all with the transporter during beam-down? Efficient, cruel, and completely in keeping with the new and deranged Khan.
Timo Saloniemi