Last on this. There are no (active) Heer officers named Loebell listed in the 1939, 1944-45 Ranglisten, or in the Dienstlaufbahnen der Offizieren des Generalstabes, or in the holders of the DKiG. Only one von Loebell, but this would have been written v. Loebell. This is a good sign. Means the name is indeed rare. My guess he will be found among the reserve officers files. There are also no matches in the KIA list, only a few soldiers and unteroffizieren by this name.
I also could not find any Ernst Poeck, this faithful comerad of Loebell�s. Looks like you have a nice two for the price of one research project here
