Lichtsteiner is a RB - and a pretty good one at that. Why he should all of the sudden be moved to centre back is beyond me.
Also, if anything, you'd play him in the middle as the two bookends (Barza and Chiellini) need to basically hold down the fort for the centre man that plays a bit more fluidly. Bonucci takes up that role currently because a.) he's a centre back, b.) he's not as composed or as positionally sound as the two bookends.
Marrone has done fine there because a.) he's awesome and b.) the position is more akin to a libero than anything we've seen in the past 20 years. He's also used to playing in the centre of the pitch (unlike, say, a fullback).
It's pretty fucking simple. Barzagli, Chiellini, Bonucci, Masi, Lucio/some late signing as centre backs. Marrone as middle cover and Caceres as right man cover. There's your central defense. Now let the backs be backs.