Dual or complex comets can have different structures and weight.
Itakawa is a dual structured Comet.
According to Q-FFF Theory comets are based on the new physics of the Fermion repulsive interference Black Hole horizon created at the surface of the sun by a solar eruption.
Secondly, the larger part of Itokawa has less weight that the smaller part.
Reason, if each Comet part is equipped with at least one interference black hole, the smaller part seems to have only one Nucleus being younger, with denser frozen material around the fermion repelling nucleus than the larger part equipped with at least two nuclei. see also:
Dual or complex comets can have different structures and weight.
Itokawa is a dual/ multiple structured Comet.