Let's speak in the languages of facts.
What kind of base does Flick have?
Take any ideological coach, each of them had a base.
Guardiola - Cruyff, Bielsa, Van Gaal, etc.
Arteta - Guardiola, Wenger, La Masia.
Nagelsmann - learned from the example of Tuchel, Pep and other famous German coaches. Already as a young man, he was immersed in tactical and analytical research.
Xavi - Van Gaal, La Masia, Pep, Enrique, etc.
Etc.
But who is Flick? What's behind him? Which school? What base?