Like I said, nearly. However, as the Flood consumes Force-Users, it will essentially become Nihilus, except much more widespread and much more effected by each infection. A Gravemind at that point would have no problem dispatching Nihilus. Also, like I said, Nihilus can't exactly control his hunger. He won't [i]not[/i] consume Jedi and Sith. And his power isn't enough to fight back trillions of ships and even more people. As for Abeloth, she has been defeated and "died". Precursors might find her a challenge, but will win, whether permanently or by imprisonment.