Geometry change entering corners

OK.. I've been out of the racin game for a while but helping a friend figure out his late model so it will be more competitive.....been reading up on car set-up, etc and understand most all of it but one thing that keeps puzzeling me is the front moment center.... I know how to find it on the car sitting in the garage but upon entry into a turn the front end dives and if you look at the position of the upper and lower a arms it looks to me like the center will move and in extreme cases the extended lines from the arms would not even make it to the Cl of the car....????

So, due to the fact that the whole idea of a moment center is to help the car corner how is the static info transferring to the moving and diving front end of a car????

Thanx in advance...