Human evolved with bigger skull that can be better deformed and allowing for the brain to get bigger,
compared to other primates.
Did the skull evolved first to get bigger and next the brain?
Did the brain evolved first to grow bigger then next the skull?
Did both evolved simultaneously؟
Do you think that both were designed to be fixed in place or it just happened
that both evolved simultaneously and it was perfect?
Evolution describes a very slow process.
It wasn't like you imagine that the skull became big in a few years and then the brain filled it up.
In short, there was a need for the human ape to evolve in order to better survive.
What allowed the skull to get bigger was a weaker jaw muscles that slowly, very very slowly allowed the skull to become bigger.
The evolution of the brain was either an outcome or a cause, but regardless, the process was happening little bit each generation.
We assume there were several homo eractus with more evolved brains than the human apes, homo-sapiens happened to be the ones who managed to overcome all the others.
the brain was an evolution of the surroundings based on the evolution theory.
as humans slowly learned to control their thumbs, they were able to discover new ways to use tools (rocks, sticks and such).
As the "motorics" became better, the brain inevitably became better.
Looking at the process described by evolution, it is without a doubt a remarkable thing and imo too remarkable to be a collection of circumstances.
We only have a drop out of a sea of knowledge regarding the human brain. so i guess this question is far too complex to answer scientifically these days.
It is however, regardless of one's belief or not, a process that had and still have a "power" supplier that motivates it all. the question is where does this "force" comes from?