my personal view yes DID is caused by abuse

But

I dont believe its the realization of the extent of the DID results in PTSD.

if it did then those that have PTSD but not DID would not have PTSD. I also know some DID people that do not have PTSD (anxiety, nightmares, flashbacks, panic attacks, reliving trauma....) symptoms.

I (and the mental health community here) believe PTSD is not caused by a disorder such as depression, Dissociative disorders, schizophrenia bipolar...

here we believe Post Traumatic Stress Disorder (PTSD) is caused by going through something traumatic and that trauma does not have to be abuse related..

examples of things that can cause PTSD
wars
natural occurring events like earthquakes, tornado's hurricanes
stress
abuse / attacks
accidents

the list goes on..

here yes sometimes people who find out they have a mental disorder or physical health problem they do go through the process of adjusting like going through a phase of denial, a phase of anxiety / reality of their problem, a phase of searching for the cure and finally a phase of acceptance. but I and the mental health community dont consider that to be PTSD.

here we dont consider this period of adjustment when being diagnosed and reactions from being diagnosed PTSD or any other mental disorder.

we just call that the normal process a person mentally disordered or not, (and regardless of what mental disorder they have if they have on) goes through when getting diagnosed with medical and mental disorders.