At this point, you're probably right. Since V.V. found his own confirmation that Lelouch = Zero, and because through that Charles has found out, it's pointless.
It's kind of funny, in that sense, that almost NONE of the Black Knights know his identity (as the only people that survived the attack on the tower at the beginning of R:2 are Kallen, Rolo, and C.C.), so I would suspect he'll reveal himself in a few episodes.
Then again, I was expecting him to reveal himself to at least Tohdoh and Ohgi once he had freed them, but whatever.