  We study more deeply the sensitivity of the $ZH$ production process in
gluon-gluon collisions to the details of a possible Higgs and top quark
compositeness. We establish a relation between Higgs and top quark form factors
which would keep the basic cancellation appearing in SM and satisfy the concept
of CSM. We give illustrations showing the spectacular consequences of various
choices preserving or violating this CSM constraint.
