Design System: All files in one project

Hi folks

I replaced a guy at the company who started creating a design system. There is no chance to reach him and ask questions. The design system is now spread across two Figma PROJECTS (both within one Figma team):

  1. Style Guide
  2. Library

Having two projects for only 3 files, which belong together anyway, makes no sense from my perspective.

Before I merge them into one project, a question for you:
Could there be any benefit or reason why he split it into two Figma PROJECTS?

Thanks, friends