^ I agree, the CMO would be most concerned with the health of those who follow. Maybe the logic was don't send a message because any rescuers would be further casualties. Also, Tracey may have wanted to keep his discovery secret and could have delayed sending until it was too late. Vague comments about not reporting until we have something definite, which resulted in no message sent.
(also, it's a bad episode)
So, what did happen to Capt. Tracey? Did he get greedy and was to exploit the youth properties of the planet or did he go nutty realizing his entire crew was dead? That could
have a negative impact on your mental state. Maybe a combination of both.
I also wonder what they did with Exeter, it wasn't damaged. Did anyone ever say?