Oh, this is getting personal, now...
Nurse Chapel?
1. Chapel didn't speak after she left the sickbay room with Spock stored inside her.
2. Majel wear's gold in the Cage, and blue in the TOS series, and red in the movies? or Maybe the changing colors in the globes in which Spock was stored?
3. Chapel stood mute as Henoch monologged on the bridge.
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Logical reasons, but not the mystery character.
Clue #4
Hey, Fred. This stuff sure is sticky.