For C2C2PD, G3GC, and C 60 @[6]CPPA there is not yet one unassailable benchmark because the difference between the FN-DMC and LNO-CCSD(T)/CBS interaction energies lies outside of the mutual error bars of either. Examination of DFT errors is informative, nevertheless. For C2C2PD, most DFT methods afford errors larger than 1 kcal/mol, no matter which of the two benchmarks is used, and in many cases these errors are 3-4 kcal/mol. Errors range from 2-4 kcal/mol for C3GC, and for C 60 @[6]CPPA they are 2-6 kcal/mol. As with cases for which the reference energy is more certain, DFT errors vary widely and there is no systematic trend toward over-or underestimation of the interaction energy.