Star Wars enjoys it's contrasts. In it's colors and in it's costumes. In it's set pieces and in its comic portrayals. Good guys vs Bad guys. Red vs Blue. Light vs Dark. That sort of thing. If there is a 'Grey' area? (And I'm sure there is somewhere, or will be eventually...) It is mostly a transitional territory. A place for Force Users who are moving from light to dark. Or from dark to light. A place of doubt and change, rather than faith and persistence. A shaky place. An uncertain place.
Best to pick a side and commit to the duality of the Force. Then we can let the human in all of us waver at bit from side to side.