IME this happens across all spectrums - faith, political or what have you. Once a person comes to power, especially if unchecked, their true selves often emerge.
So you are saying that powers didn't corrupt him, as in powers "didn't change him", that his moral compass was already broken long before he came to Medina?
Is that what you are saying?
That is his "true self", Muhammad was always ambitious, vain-glory, petty, vindictive and tyrannical. That's all these attributes were hidden away, until he has real powers.
What I think you are saying is that Muhammad was like all this, before he even he left Mecca or even younger still, like before he became a prophet. Is that what you are saying?
I'd suppose that it is possible, that you are looking at him that powers didn't corrupt him, he was always or already corrupted.
I would suppose that a possibility if that's what you are saying. That we are looking at Muhammad from two different perspectives.
Did you know I haven't taken a single subject on psychology?
I'd suppose I misread your earlier post. If that's the case then I am sorry for misunderstanding your point.
Okay, expanding my view to answer your earlier question:
I am of the view that a person, not just Muhammad...so I do mean "anyone", is "not necessarily" born like this, as in born with your "true self".
I wrote "not necessarily", because there are many possible views to view this, with no real wrong answers.
I would suppose that it is possible to be "born with it", literally, like a person inheriting his (or hers) traits or characters from one or even both of his (or her) parents, thus inheriting his behaviour like inheriting physical attributes, sort of like if his father is tall than he might become as tall as his father.
So inheriting personality, as in genetic imprinting.
That could be a possibility, where behavioural attributes can be inborn.
The problem with any of this, is that we don't have any accurate account about Muhammad and his parents, because a lot of their lives are shrouded in legends and propaganda, especially anything regarding to what Muhammad's life before becoming a prophet.
Like I said, it is a possibility, but I am of view that "true self" could more likely to be "nurtured" then it be "inborn".
That "life" is not just what you inherit from your parents that personality, behaviour, character or traits come from personal experiences.
"Life" is like a "journey", made from what you are personally experiencing at that time, who you met, and the decision you make. That character can be nurtured and build on top of each experience, so your character was built from the sum of a person's experiences and choices made.
What I am saying that your character or personality can come experiences, from the "road taken" or the "road not taken".
For instance, in the beginning of Muhammad's preaching to the public, Muhammad tried to gain supporters and believers including Jews. When the majority of Jews rejected his claims of being the new prophet, that rejections caused resentment towards Jews.
I don't think he was born resenting Jews. Those (resentments) and his hostility towards Jews came from experiences.
So to sum it all up, some true self can be "born from", le genetic imprinting, but most true self come from personal experiences and choices made in those moments.
Do you now understand my perspective?