@LukeAlmighty I think that sometimes when people say "Grey Jedi" they don't actually mean they are a Jedi, just a force-user who is not affiliated with the Sith or the Jedi. A lot of people do point to Mace Windu as being a "Grey Jedi" though or at least relatively close to one. Anakin was also a Jedi for a while even though he was also not quite a "Jedi."
I wouldn't say that the Dark Side is bad necessarily, because there are force users that use Dark Side techniques like Force Lightning that aren't necessarily evil, right? Or is that stuff no longer canon after the Disney takeover?
But I'm not super familiar with intense Star Wars lore, mostly just things I've picked up from osmosis lol. I know a lot of it is also not super well thought out and made up by lots of other people outside of Lucas so it makes it hard to discern what's canon that shouldn't be canon and what's not canon that should be canon.