After Dean died, Matthew's expression became indifferent, and he closed his eyes to delve into his mind and try to see what had happened to those abilities.
They came with a large amount of information that settled in his head, like a closed book that he could open at any time. The fact that he did so was something he had prepared in advance.
At the time, the division of skills could not be done naturally. He needed to turn each of these skills into a separate book. The book was initially empty and only explained the skill, but as the years went by and the skill (book) was used, it would be filled with different types of information.
To say that these skills were divided from him to gather information is 100% true, and the way to gather it is in that book.
All the information about those who had used them over the last 10 million years was written there, including who used them, their names, the amount of power that arrived and the places it traveled to, their family, etc.
