"When armatas are kept in groups of many males and females, the dominant males will show colors, the rest will darken, at the end only one male will stand out."

This is common in many Cichlids so I understand exactly what you are saying. This even effects gender at least at a young age in a few animals, so anything is believable to me with some proof.
The only thing is I have had lone males show darker colors when in health and bright green/red coloration under stress. This has been noted with many Gono's as well out of Malaysia at least. I also have found diet and UV to play a role in coloration. Your observations seem to be very different so it would be interesting to find the factors that are so different.

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