john_tullamarine thank you for your reply.
I believe crosswind will affect approach energy. For example if I only have a direct crosswind during approach although I am approaching at Vref ( Vref + 5 for B737 ) I actually approach with a lower ground speed.
Also if I just approach at Vref whine having a headwind I will touch down with a lower energy ( or ground speed ) which is better for stopping.
I know that there is a concern that the wind will die near touch down and thus this additive was put to cover that in case it happens and there was no time counter act with throttle but I don't see why the cross wind is not taken into account if this was the reason for the wind correction. My only explanation is that you can gain that speed lost from a dying crosswind by reducing the crab angle ( which you will do anyway to keep the center line )which can be done quickly but I am not sure.
again thank you for explanation.