Moving Meditation is basically a way for you to repair T3 if he's injured in battle and recover FP if I'm not mistaken. I've never had a chance to use it, as I don't take him into battle much, but I believe that's what the guide says it does.
As for the hologram itself, it's dependent on the gender of Revan. Males get Bastila, Females get Carth. Either way it's not the hologram I'm so concerned about, but the conversations that follow. Though I have heard that T3 tends to be one of the more buggy characters in the game. I know mine is. He's pure LS, but whenever he's on the level up screen