Folks, this is getting dangerously close to story-idea territory. Probably best to curb speculation about where the Vulcanoid Rigellians came from.
As it happens -- and I should've clarified this already -- I've done a fair amount of research and thinking on the inhabitants of the Rigel system as background for Rise of the Federation.
Yes, I see what you mean; sorry, we probably got a little carried away there. I'll stop speculating now.
As someone who's been hoping for a "definitive Novel 'Verse Rigel" for some time, I'm pleased to hear you'll be featuring the system in Rise of the Federation
. I'm ever more excited for this one.