This situation is very very unlikely unless partner break off 1 month before exam then cannot focus, or family tragedy.
FCH means this person has a really solid track record for every diverse module thrown at them. In other words very flexible, very versatile and able to handle tremendous stress. Bosses are more interested in these attributes than the actual module. Not all... But many are.
Of coz cannot say that director of accounts employing accountant don't look at the students accounts grades... If this fch got B for all the accounts but aced everything else?? Its possible.

But I know you are jesting.