getting back on topic, Akari said MSG wasn't Darth Ni(whoa, i rhymed), however, he did not say Darth Ni wouldn't be a sith lord
in fact, i believe akari's exact words were, in response to a photo a MSG,
"That's not Darth Ni"
I'm too lazy to go find the quote, but i think that's what he said, which indicates that there might be a Darth Nihilus