It's possible since taller people tend to be natural leaders. I believe maturity is also related to how well someone metabolizes carbohydrates. I have GLUT1 deficiency syndrome which is basically permanent ketogenic metabolism and my maturity decreases to that of a child if I consume carbohydrates.
The chicken came first as there's birds that don't lay eggs. It's not like we can prove otherwise. It is all speculation. Just because you can't... It is not an indication that a supernatural power can't create a tiny egg that grows into a new animal with organs that function in complete harmony. I have superpowers and I definitely believe there's higher powers but they definitely don't want us praying to them.