In the beginning there was sat. This sat , ishvara, he desired and manifested from unmanifest state.
He did not undergo any change.
I the atma am that brahman, I am here. I am, is my svarupa, I am of the nature of consciousness. I alone am manifest, my manifest state is called as jagat, with various names and forms.
I think, that there is no order, due to lack of knowledge of the order in the mind. However that is due to ignorance belonging to the mind, and not a lack of knowledge otherwise. There is knowledge and it is hidden, and hence the need for a mind to know one by one. By hiding , there comes a purpose for mind, to know things one by one. Ishvara is manifest and unmanifest both states. Manifest state is all knowledge, that via mind can be a 'known' or knowable . Atma ishvara himself is that knowable , and himself is the knower, and himself is the knowledge. From the standpoint of samashti, ishvara is all knowing, there is no ignorance whatsoever, no ignorance. So there is a specific role here, now, an individual mind, characterized by ignorance, which means there can now be an ego, saying my mind, this becomes a possibility, by identifying with the mind and with the ignorance. In reality such an identification is not real, as there is no real knowledge, known, no real ignorance, no real knower or knowing process. It is true only from a mithya standpoint, while satyam is brahman, the reality who is devoid of names and forms, and the truth of ishvara.
The vastu, the atma, the brahman is ishvara. Ishvara remains as nirguna and does not really cause any jagat etc. That real vastu, 'I AM'.