Lets say Abd-ar-Rahman III takes ill in 916 and passes away after a brief period of illness. At this point, Umar ibn Hafsun is still alive and his rebellion in southern Spain is still alive, damaged, but alive,and his successor, Al-Hakam II, will be barely 1 year old and have to deal with Abd-ar-Rahman III' three uncles that had accepted being passed over by their father, but would be less likely to accept the rule of an infant. With the Umayyad emirate likely falling into a period of chaos and unable to support the enemies of the Fatimid Caliphate in Morocco is it possible for the Fatimids to invade and conquer Spain?
With their forces tied up in Spain could the Fatimid Caliphate still conquer Egypt?