I think you may be forgetting just how ahead of the curve Xanthe is compared to everyone else. Xanthe has tech that turns his thoughts into books! His thought books make up entire libraries by themselves. I don't think that it's that people can't duplicate his work or knowledge but that it would take forever. He's been working with monsters and expanding available technology in perhaps dozens of fields, for the entire United World and thus the whole globe for decades. He's probably fathered entire sub-disciplines of knowledge and technology that nobody but him understands. Tanos is but a child in comparison to Bramon. Deryl, not even a mewling newborn. More like, a still developing fetus. He's made a new language that nobody has either enough time. or wishes to expound enough effort to understand.
Bramon's biggest threat currently for losing his status is Deryl, Mia, and MC. MC could literally steal all of his knowledge upon Xanthe's death, and give it to Mia and Deryl to create a new operation off of his life's work.
