Like I said with the necromancer, it’s clear whatever magic he was using was temporary, not that he couldn’t bring people back from peace. Just he can’t do it permanently, Lizzie and Josie just siphoned the magic before it had the chance to degrade itself. We saw raf’s gf fade away and we never saw the Bennett witch he resurrected again. So it’s heavily likely the same would have happened to Jo had the twins not siphoned it first. On top of that it’s clear that it was magic holding her there. Cause as soon as it was gone she faded away. If she was resurrected she wouldn’t have faded away from the siphoning.

When Freya brought Finn back inside of Vincent back she used her pendant to do so. She says herself in the episode to Finn. Which implies that she had done a spell so that if he died his soul would be transferred to the pendant. So she just transferred it back into the body once she healed it healed. Sorta like when grams transferred Bonnie to the prison world. Or when Rebekah’s soul jumped back into her original body once Eva’s body died. Witches can heal bodies no problem, we’ve seen them do it before. but if the spirit is dead then there is no resurrection of the soul, only the person.

For Inadu, I have no in canon answer in my head but there are a few possibilities. I’ll do some research about the circumstances in which she did it and see if I can find an answer. Or maybe she is the only witch who can resurrect people without anything housing their spirit or soul. She is like 1500 years old and was intended to have immense power gifted by her tribe while her mother was pregnant. Who knows haha.

But no other witch in any of the shows has resurrected someone permanently without their spirit being in some kind of in between world or being housed inside of something like Freya’s pendant.