pivotman

noun3

1. •
   A pivot; the soldier around whom a body of troops wheels.
2. •
   A player in a central position.

   • An injury had sidelined our 6-10 senior pivotman, Connie Dierking, so we were still adjusting at both ends of the court. — 2008
3. •
   (figurative) A central or key person; someone around whom a particular project etc. rotates.

   • George Stephanopoulos was the campaign's floppy-banged pivot man for communications. — 2017