On the contrary, for systems with more strongly coupled chromophores (e.g., coordination metal complexes with organic ligands), both ECI+FDA might potentially fail to reproduce the electronic spectrum even qualitatively, independent of the excitation rank (ECIS or ECISD). This is presumably due to the loss of size extensivity induced by non-zero couplings between the GS product and the LE products (i.e., violation of Brillouin's theorem). Employing ESP embedding in such systems is expected to drastically improve the performance of ECI (over FDA), producing mostly all states qualitatively, but with excitation energies being off by 0.2-0.3 eV.