This is used to describe the difference between the person you know you could be and the person you are ; in other words, the difference between your authentic and your in-authentic self. The Womb twin hypothesis states that womb twin survivors constantly re-enact the life and death of their womb twins. To re-enact the life of your MZ womb twin, who is half of you and made of the same genetic material, you also re-enact the difference between you. "The person you could be" is your whole Alpha self, but the "person you are" is someone diminished by the need to keep alive your Beta womb twin on your life. But that varies according to what actually happened.
For example, Stella says:
I am quite tall and well built, but often inside I feel very small, almost invisible. When I feel like that, I can scarcely do anything, and I feel helpless and no good.Stella has identified with her Beta womb twin and is living out the memory of a little, helpless Beta individual while at the same time being a naturally strong and capable Alpha individual. The gap between what she knows she could be and what she is, is her "Alpha-Beta gap."
What is the size of your Alpha-Beta gap?
This series of diagrams may serve to illustrate this. I am experimenting with a diagram like this for the new book about healing for womb twin survivors, which I am currently writing.
The black line represents the size of the Alpha-Beta gap, which varies in size according to how much of the pregnancy the womb twin survivor spent in the womb after the death of the twin.
The blighted ovum: