In The Phoenix Project the author describes an interesting antipattern: Brent is a super-important dev-ops engineer that personally knows the details of every new and old implementation and setup, but he does not share, document or distribute his knowledge. Ultimately every small task or large project crucially depends on him.
While this Brent is hailed as a hero by the whole organization, the main protagonist of the book recognized that this is an anti-pattern and starts to break down this information "person-silo" by shadowing him and documenting his knowledge.
Is there a name for this antipattern? Is it widely recognized?