Similarly while it says: " Surely my Lord is the Protector of all things ".
Similarly while it says: " Surely my Lord is the Protector of all things ". (Surah Hud, 11: 57); it also says: " He sends protectors to watch over you until death approaches you. Then Our angelic messengers will, without fail, take away your souls ". (al-An'am 6:61). In this verse the angels have been described both as protectors and the extractors of souls.
Hence from the monotheistic point of view the existence of any medium is not objectionable, nor is there any harm in ascribing an arrangement to someone who carries out the Will of Allah with His permission. Anyhow, firstly Islamic decorum requires us not to ascribe creation, sustenance, giving life and causing death, to anyone else but to concentrate our attention on the real source running the universe.
The mediums or angels are only Allah's creation and a manifestation of His supreme power and wisdom. And secondly to run the affairs of the universe, Allah has devised a unique system in which angels are employed as mediums. Man occasionally can attain a position higher than that of the angels as a result of his evolutionary advancement but he cannot replace any of them as a medium.
Revelation always comes through an angel, and it is an angel who is always detailed to extract the soul of everybody. We cannot determine exactly the limits of the Wilayat of Control and supernatural power of a perfect or virtually perfect man. On the whole the Qur'anic and other religious texts indicate that man can definitely reach a position where he dominates the world. But what is the exact nature of this domination and whether it has any limits or not is besides our scope.
Another point worth mentioning is that the Wilayat of Control is attained only by him who is absolutely free from the control of his passions and evil desires. It is not bestowed on any arrogant self-seeker. A man who is swayed by his personal whims and desires is not fit for such a miraculous position. The person who holds this Wilayat is so pure that, his will, unlike our will, emanates from an inner motivation and a Divine signal.
What the nature of this signal is and how he receives it is not known to us. Such persons are sometimes guided by Divine light but occasionally they appear to be unaware of the most ordinary things . As for the Qur'anic verse, " Muhammad, say, I have no control over my benefits or sufferings without the Will of Allah ".