While we have demonstrated that our framework provides accurate exciton coupling predictions for the class of FREA molecules, it remains to be shown that this accuracy applies widely across the entire space of organic materials. To this end, we studied the accuracy of our framework across the dimers extracted from 1000 crystals from our database. The coupling values predicted from our framework compared to ones obtained using DFT-calculated ATC values are shown in Figure . Our framework succeeds to predict coupling values for the majority of dimers. However, there is a notable vertical The position of this vertical line at exactly 0 meV is suggestive. It either requires a very precise cancellation of terms in the coupling expression in Equation (1), or for all terms to be negligibly small. In either case, very precise values for the ATCs would be required. Errors in the predicted ATC values would either disrupt this cancellation or create terms with non-negligible magnitudes, leading to inaccurate coupling predictions away from 0. To investigate how errors propagate through the summation in Equation ( ), we express the DFT-calculated ATC values as