It appeared to my observation on patients in an obstetric practice that ABO type had some effect on describing temperament.
So ABO type doesn’t compete with NPA theory but simply may subdivide any given NPA type.
In a sentence, ABO A types seem to be low temperament or low activated type while ABO B seems low but higher than A and ABO O high temperament. I have written some papers on the role of ABO in behavior if anyone wishes to see them.
Referring to the story of the surrogate mother she looks and acts low temperament, says less than the egg donar and is calmly helping her friend accomplish the production of quadruplets while the egg donar is talkative and leading.