Fuck yes good point!
I'm guessing she can turn it on and off, though if she could she would need a good reason not to check it out as soon as she knew she would work with him. Plenty of possible explanations, but maybe she wasn't surprised at that moment and saw it already. She just never encountered it before and still kind of gets lost thinking about it... I think the flashback might have been hers.
And I imagine that the blackness is why he got chosen (would be a little useless if it just came from his anastasis), though at the same time it might be a reaction from him as a special someone being brought back.
So frankly I'm so involved in this discussion by now that I could actually imagine putting pressure on
Red Rocket for some spoilers (don't do it please, the more this builds up the more we will keep this thread alive
)