Can a full-time hunter whose mind was stolen by Culolo still use the stolen mind?

It's obviously impossible, so Nion can't do divination. This is not copy and paste, but cut and paste. Moreover, people whose reading ability is stolen can't die. Once he dies, the stolen reading ability will disappear from the book. So I feel that the book is not so safe. However, to obtain such a great ability, the constraints will of course be harsh. Does it mean that people become ordinary people after being stolen, but the ability to be stolen disappears?

Give points if you are satisfied ~ ~