pivotman

noun

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.”

3. (figuratively)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.”