I don't really understand the whole metallic sand KKG. Is it genetic? Or do some Sunagakure shinobi just have the talent? It was said that the 2nd Kazekage (or whoever) learned to manipulate metal (or gold was it?) through watching Shukkaku. Gaara received the power to manipulate sand after becoming Shukkaku's Jinchuriki, and it's unclear how Sasori learned it. Now there is Shinki.
Yurui was stated to be Kumogakure's only Elite Shinobi, or just an Elite. He's basically the Bolt/Sarada of the Kumo team, the rest of his team members were apparently just regular members.
I don't know why Shin is there because he negs every next generation member. Especially if we are talking about the one who fought against Sasuke, Sarada/Chou Chou, and Naruto. His potential is fabricated tbh, I doubt they would even allow him to take part of the Exam, much less be a shinobi.
But if Orochimaru can have kids ... then who knows :lol