(Guys this is a bump, but I just really wanted to discuss something I could back up a bit.)
It's the eye symbol, they both are near perfect in both how they are positioned at the near same angle. And unlike the other eyes which just look like eyeballs, these two both are diagonal that makes them appear to be the same.
The Twili are not part of the Tribe but what if there were defects who clung onto the olden ways of the Tribe, that would make sense and would back up my theory a bit, however it is still only a consideration that there could be defects of the Twili.
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Another thing is that I believe another example of a defect of the Dark Tribe while having relationship (non-mushy) with Agahnim is Veran- Sorceress of Darkness. She possesses blue skin which could lead her to three points-
1) A Zuna
2) A Twili
3) Random monster
Should the answer be 2 then that would mean that OOX has connections to the Child Timeline.
What leads to me linking her with Agahnim are two things - Her involvement with a
dead Ganon, and the little eye symbol on her robe.
She could be a part of the Dark Tribe which Agahnim mentioned back in Alttp which would mean that Veran is a Twili like Agahnim would be. This leads to OOX standing as a sequel to Alttp in some form.