Kudos for noticing all this.
Either you’re a roleplayer or the RP community would love to have you.
Thanks for posting this and I will cross-link it. Can’t say how much I appreciate this compilation.
Sylvari Physiology as a Narrative Device
As for Caithe’s orange glow in the past…
The “memory” sequences in Season 2 all had a very noticeable sepia tone. Re-watching the scenes (thanks Youtube!) I believe the sepia tone tinted Caithe’s glow so it appeared orange-ish.
But I do like the theory that two sylvari with a close bond could develop a similar glow.
For some reason, their portraits in dialogue boxes and in their icons (when targeted) don’t seem to show their proper glow color and leave it white. Some cutscenes in the Personal Story might do this as well.