To proceed beyond considering only the energy difference for the conversion of LE to CT excitons, we consider the LE-CT couplings and analyze if the disorder in them could be indicative of some dimers not participating in the process. We also investigate if for such A specific aspect of the rubrene-C 60 systems that requires extra is the (near) degeneracy of the 15 lowest LE on C 60 , stemming from the 5-fold degeneracy of its HOMO and 3-fold degeneracy of its LUMO. For the same reason, also the CT states are 3-fold near degenerate.