We extensively discuss the differences between the models and attempt to explain the variation in solvation free energy with respect to electrolyte concentration given by the RISM (TIP5P) model, which are not observed with the other models. To this end, we use 2D planar-averaged solvent charge distribution plots, which revealed that the description of the double layer differs significantly between the models. The TIP5P model shows a strong charge variation along the direction parallel to the electrode, in agreement with the CANDLE model. This was not observed in the SPC model, which displayed a simpler charge variation only along the direction perpendicular to the surface. From these discussions, it is clear that any justifications are self-consistent and should be interpreted in the context of the RISM theory, with links to the experimental reality being speculative. Indeed, the lack of specific adsorption, especially of ions greatly limits the comparison to experimental expectations.