Whatever the numbers turn out to be, it is highly unlikely - no, impossible to lose lean body mass on an LC diet because it contains adequate protein. One loses lean body mass when one's diet does not have enough protein. The body begins to take protein out of the muscles for fuel. But we have arranged to have the body use stored fat for energy and also to have enough protein coming in each day so that there might even be extra, rather than barely enough. Also, I'm pretty sure that the LBM also contains bones and organs.

Nat (as always) is right. Your size may be much smaller on LC at a higher weight, than someone losing on a low fat diet. I know I was 2 sizes bigger at this weight on the way up, than I am now on the way down.

Your body will decide how much fat it wants to lose and you might even increase your LBM if you exercise. You certainly will not lose LBM on an LC diet. Don't sweat the numbers because you haven't seen the end result yet.