Did Riot accidentally confirm Dark Star Aurelion Sol

Dark Star Kindred? idk

I feel like you're making a huge assumption with very little reason to assume that he would be the best choice. In fact, I would argue that the fact that his theme is so closely related to stars, it would be less likely for him to get a Dark Star theme.

Thresh and Varus have very little to do with a celestial theme that it could honestly be anyone.

idk... He creates stars, he doesn't destroy them. And the dark theme is fairly close to his original skin. Would still be a cool skin though.

I'm not sure about Aurelion Sol. It's not implausible, but it's almost mundane when you consider Aurelion's default theme.

Moving on...

I don't believe Yorick is a good match for a Darkstar skin. Honestly, I don't think he's a good match for much at all, simply because of the specificity of his theme. However, creativity always finds a way.

That said, I think Dark Star Nasus, Singed, Illaoi, Maokai, or Aatrox could be great for toplane. I specifically like Singed, (inky black stardust poison and blackhole W), but I kind of doubt they'd choose such an unpopular champion for a Dark Star skin.

Dark Star Aatrox, Dark Star Talon, Dark Star Fiddlesticks.

He has Eternum Rek'Sai which already has a Dark Star-ish feeling, it could be Nidalee or Gragas. He can be like a Glutinous villain

dark star poppy, bring the hammer down on some planets

As a main I would love this skin, but it would never happends. Think about it, the classic skin is about galaxy and with the dark star skin it would be like same, but only darker