So Skye's mother is the immortal Chinese woman from 1945 from whom Whitehall/Reinhardt stole immortality/youth. And the Doctor is using the Diviner to pull Reinhardt and Coulson together so he can... what? Kill the man who murdered Skye's mother in front of her? Kill everyone? We haven't seen him touch the Diviner, have we? So he's not "special" like Raina and Skye. The special people are definitely Inhumans as there's no mutants kicking around. If it's Inhumans-and-blue-aliens-only does that make Skye half-Inhuman? Making the blue guy a Kree?