Perfectly logical, but still a surprise.

For those asking. George has no mark. Tedd is hyped up thanks to his discovery and that means he's worth a lot of light.

If you didn't put the pieces together yet:
1) he glows when he's really happy (happened twice at least)
2) he is a much more dangerous rarity
3) his aunt is positively terrorized of him being unhappy
4) he was suddently and uncharacteristically hyped after an intuition he had little right to have, as if he was "full of energy" and needed to do something with it; this just happened again
5) his early-years backstory matches well with there being a correlation between his happiness and his magical powers (the wand thingie)

All in all, I think this is nothing new. I want to see what kind of shenanigans happen because of the misunderstanding though