A33Zab:
Nice diagramm, but it's not answering the post question. FCMC takes over CG calculation only after initial ZFCG and ZFW entered by pilots. It does't have anything to compare these values with (unless aicraft if fitted with weight and balance system).
Also I can't see why data in two FMGSs could be different. They are cyncronized and once your enter numbers in one of them they immediatelly pop up in the other one.
Today we did it again: this time entered ZFW and ZFWCG well outside aircraft limitations. And - no effect. Not a single message! How nice for such an advanced aircraft...