Green can represent dark jedi

Dark jedi typically use red or purple. Unless the lightsaber is stolen of course.

General Grievous stole and used both blue and green lightsabers
just trying to help with an example

can i remind you of epuisode 6 IE return o the Jedi where look whom is wavering to the dark now has a green lightsaber also Many Dark jedi looking for followers will temp padawans who are about to make their lightsabers witha more powerful recipe (usually green)

I'm guessing either english is not your first language or you are rather intoxicated at the moment, but yes, when first turned to the dark side many dark jedi have a green, yellow, or blue lightsaber because that's all they had, but the gentlemen in the video have always been on the dark side they're black. Black is dark. It was a joke.

Heavily Intoxicated ^10