rika the childhood friend of yuta was freed but the cursed entitiy, the husk of what was housing that soul, is still there and yuta call it rika still and use it still
Yuji is a first grade sorcerer at best someone of that level it's not even a challenge against a special grade sorcerer, a special grade sorcerer could fight 10 first grade sorceres at the same time or maybe even multiple special grade curses and still win that's who broken they are.
Fake Geto used the cursed technique of Mahito to reconfigure the brains of two types of people: people like Yuji who he made them eat cursed objects just like Sukuna's fingers. Yuji is special in that he can hold back Sukuna, but most people can't do shit so at least 99.9% of this people are being taken over by the cursed objects and reincarnating an ancient sorcerer from the last 1000 years. He made binding vows with them in order to get the cursed objects but when he switched to Geto's body, they became null, meaning he doesn't have to fullfil his end of the vows anymore. The other kind of people were those who have cursed techniques but can't use them because they weren't born to be sorcerers, now this people have access to their cursed techniques, just like Mahito helped Junpei to do.
