I like to invalidate a few things here:

Creativity and Intelligence in my mind is no merit because no one has ever told me about how creativity and intelligence plays a role in dissociation.

Add to determining factor the number of abusers

Forced into silence, family threatened if told

I'm not even sure about 'safe' family because if they have no knowledge about the questions to ask or what you look for then they are just family more people to create apparent normal parts/emotional parts from possibly

I knew a person that had abuse from a grandparent for seven years no dissociative identity disorder....

I read also online about 2 sisters that when through years of cult abuse no dissociative identity disorder

What happened in those two examples.

I just didn't like what you said about weak and sensitivity

No it is a coping mechanism that is why most of us shouldn't be in therapy unless something sever is happening to mess up your safety! If you black out across town and are found on a side walk, admitted to psych ward then get diagnosed then no choice to be outed. Most of us don't cope that bad where our parts are making us very unsafe...Some of us are well protected high functioning with well paying jobs and career that can keep us incognito ....I think that is majority of what is story material that are in books and movies.