Imamology Basics - Who are qualified and authorized to comment on the verses of The Holy Quran?

It is incredible that despite the Holy Prophet of Allah having left two weighty things to hold on to firmly, most of the commentaries compiled on the Holy Quran are primarily based on some sciences such as theology, philosophy, logic, Mysticism, jurisprudence and historical accounts and even experimental sciences.
Ahadeeth or narrations and traditions of the Holy Prophet, the Lady Fatima and the Twelve infallible Imams A.S. as the introduced qualified commentators of the Holy Quran, are given less significance - leaving a bigger field for the personal deviant views, and hence resulting in many sects within Muslims!

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