I think that's what people recommend (solo rogue during aoe phase) because they can mitigate some of the fall damage + recuperate to stay alive, but these days we have our arms warrior stay with rohash and our rogue plays with the anshal group. We've had our ret paladin stay before too, but not sure how well that was working since we ended up going to warrior. Whoever you leave on the rohash platform just has to be aware and knowledgeable about how to stay alive until the team gets back.
