Oh, I'd much rather she didn't have a part in it whatsoever. I was simply replying to Taggerung's statement. J'onn and Kal as Black Lanterns is obviously a serious, powerful threat; with that much punch on their side, the bad guys have a major advantage that the good guys have to seriously worry about. This is clearly true. Putting them in the ranks of Nekron's army is much the same sort of gesture as making the rings out of the Anti-Monitor's body or whatever that was - a clear sign that Shit Is Serious and We Are All Completely Fucked.
I'm just saying that there's absolutely no way that Diana is included in that gesture. The idea that Diana's involvement could be a big deal, that what team she's on is a significant factor in the outcome, would not occur to Johns, and it's guaranteed she won't be used that way. (Which is why it's good if Johns doesn't use her.) Same deal as Final Crisis.