One Ego is build on memories.
When there is memories of wholesome actions / behave, there is wholesome personality, and vice versa.
But why wholesome personality have more chances to get some insight? Because when one have wholesome behavour, one also have more developped attention, his awereness and concentration is more developped, cause he is awere and concentrate of what he do, he have to pay attention on each moment to be able to stop any unwholesome habit.
Also, wholesome behavour is motivate by good, lovely, metta intention. By 'loving' something, we understant it, we know it, we penetrate it, like a gravitation that penetrate dhammas. And by penetraing dhammas we see their nature, that help us to undertand our own nature.
Thats why wholsome personality have more chances to get some insight, by attention, concentration and metta.
Siila Samadhi Panna
Sabbe dhamma anatta
We are not concurents...