Heyo. Just reading through this, I noticed both in COMP/CON the Couatl doesnt actually have a trigger for 'my plumage is the most beautiful'. At current it reads:
"1/Round when a hostile character within Sensors and line of sight, the Couatl may use its reaction to force them to make a Systems save", so it isn't clear what the trigger for this is, eg: if its when a hostile character begins their turn in line of sight, attacks an ally within line of sight etc.