Q: Are the Brahman and the Universal Consciousness one and the same?
The universal consciousness is the universal Brahman — in it you see everything as one.
Q: Is not the human being in his true reality superior even to the Supermind?
What is the true reality of a human being — and how is it different from the true reality of any other being? The true reality of all is the Divine.
Q: Is not the Supermind one instrument of man for realising the Divine upon earth?
Realising means what? You mean manifesting, I suppose. Anyone can realise the Divine, in the sense of being conscious of the Divine.
Man is a mental being in a body — how can he have command of the Supermind which is above mind? Even Overmind is far above him.
– Sri Aurobindo