Free surplus and required capital should together form the excess assets or net asset value of the company. As part of the analysis of change in embedded value (AoEV), the change in excess assets will also be analysed.
Ideally, you can imagine an AoEV table in which the various components of AoEV (e.g. actual vs. expected experience, assumption/modelling changes, return on excess assets, unwinding of RDR, etc..) listed as rows, and three columns for each of NAV, VIF, and Cost of Capital.
Cost of capital can be analysed as well. For example, if RDR is changed as part of assumption/modelling changes, then cost of capital can change if these figures are discounted at the RDR. Also, if the modelling/assumption changes result in change in reserves and if reserves are used as a driver to calculate the pattern of solvency capital, then cost of capital can change as well.
So, all in all, each element of EV will need to be analysed for any changes in an AoEV exercise.