The model attributing the occurrence of local Frenkel exciton levels in doped naphthalene crystals to charge transfer effects is investigated for dopant concentrations high enough to enable a host molecule to interact with multiple impurities. The predictions are compared with those of the conventional model where the local levels are explained in terms of a substantial perturbation of the diagonal exciton energy, and found to differ for some deep local states. In view of existing ambiguities in the experimental data, new experiments are suggested to establish the mechanism of local state creation.