I always thought grey Jedi was pretty silly. Not neutral force users, but the Jedi & Sith are much more akin to religious factions; and a non-practicing Jedi makes you not a Jedi.
Look at Fulcrum Ahsoka. She's still a morally good character, who protects those weaker, helps the rebels, and fights tyranny in the galaxy regardless of the form it takes. Regardless, the minute she renounces the Jedi council and turns her back on them, she's no longer a Jedi.