None of them was top down in companies I worked in at the time. They were all stuff developers read about and then pressured management and peers to start using.
Management caught up and started to talk about them only years later.
Yeah, RCS was what, early 80s? Devs I knew were mostly on CVS by mid 90s and around the time Subversion became common (late 90s) things like PVCS and Visual Source Safe were starting to be required by management. Perhaps a bit earlier with super technical orgs. That's a much more typical flow.
Management caught up and started to talk about them only years later.