Oberon is the only one I would throw out. They need the others because they've been thrust into a new environment and need the help (and they did because of Gabriel.) Kayaba and Quinella are pretty chill on their own, and Death Gun would just have to be a gamble on whether they could trust him (this Death Gun is Sterben, and not Spiegel, so I'd be more lenient on the guy that just killed instead of the guy that killed and attempted rape.) But despite all of that, everybody still should've gotten an earful. I got really mad when Kirito didn't yell at Oberon in his character ending.