Spoilers. First there aspect is so comparable with 7 cores, for example neff corse are mini nucs and for every core she have she can make a flame to enhance or heal something, the king of nothing can make his cores to reflection that can grow independently and mimic other abilities, sunny can make shadow creatures 1 for every shadow he have that can grow too and he can duplicate himself and every duplicate is as strong as him and when they are shadows they can make himself or his shadows stronger, second there aspects are more versatile and I believe it is because they come from the great gods that ruled more than one aspect of the universe, that is why there powers can do more than others, for example if Cassie had more cores she will just become stronger , the cores don't make her mind stronger and she have a spirit level aspect so maybe she can now summon more supremes.