given, "a very temperamental person with an inflated view of their own talent or importance."
Linus is certainly temperamental, but you'd have a hard time convincing anyone he's less that a world-class developer, and critical to the linux community.
His creation is used to run half of the world's smartphones and probably 90+ percent of the world's servers.
His other creation (git) is used to develop maybe half of the world's software projects.
Having this in mind, I can't really imagine how can he have an "inflated view of their own talent or importance". I would say he is even quite modest...
Linus is certainly temperamental, but you'd have a hard time convincing anyone he's less that a world-class developer, and critical to the linux community.