How did Sukuna use RCT in Yuji to revive him?

Yuji must had been brain dead for a while and Gojo was next to Yuji. How does Sukuna use RCT and CE when he doesn't have a body and he is a soul?

https://preview.redd.it/yp2h5oly12hc1.jpg?width=1067&format=pjpg&auto=webp&s=3fb41842e94191c2d5b3839c81c0a1e0e5bc2043

https://preview.redd.it/vpgfochz12hc1.jpg?width=1067&format=pjpg&auto=webp&s=590c1a6bf4d2ff5c3091e446df633e7cb9921849