The yogi cannot be Gnani.

The essence of Mandukya is:- Do not be satisfied with rituals, yoga etc. which are good in their own way, but inquire. Into what? Brahman and Atman are things you can never see. So do not inquire into them. Inquire into the world around you, which you can see. Science tells you it is passing away every second. Everything is dying repeatedly. Where is it going? Thus you follow up your inquiry into what you can lay hands on. How can you inquire into Atma which you cannot see? So first we deal with the known and seen, this inquiry leads up to the unknown in the end.

Yogi shuts his eyes the world confronts him and then has the temerity to declare that it knows the world to be Brahman! Because he has not inquired into it, he knows nothing. 

Yoga helps the yogi by giving him the feeling that the world is not worth bothering about, it detaches him from the world; it makes him treat the world as a dream. It does the same to his ego to some extent because he becomes indifferent to what happens to him. But this is only feeling, he feels these things only but does not know that the world is mere mirage. Such knowledge can come only after soul-centric inquiry and in no other way. 

That is why the yogi cannot be Gnani. It is the difference between feeling and knowledge. Feeling of the yogi that the world is unreal may change tomorrow because all emotions are liable to change; and the fact is that yogis do change, as when going after women they lose their sense of world unreality though previously they felt it. 

A permanent view of the world as unreal can come only after soul-centric reasoning; such knowledge cannot change. Were the seeker who is sufficiently sharpness he could grasp the unreal nature of the world by soul-centric reasoning alone.  To know whole truth, one must know the whole universe, otherwise he gets only half-truth. 

Sanyasa is not the means to acquire self-knowledge or Brahma Gnana.  Renouncing the worldly life and accepting sanyasa or monk-hood means incapacity to think deeper, an impotency to inquire and reason. 

Sage Sri, Sankara’s commentary:-  Page 489: "The knower of Brahman wears no signs.  Page 500 asks in effect "Tell us what you know, show it, and let us examine it under the mental microscope." It means we must bring notions and beliefs out of vagueness into clearness. It also criticizes the mystics who claim superior knowledge but who cannot communicate it for purposes of verification.

On page 482: On Gnani: "The knower of Brahman wears no signs. Gives up the insignia of a monk's life,…his signs are not manifest, nor his behavior."

YOGA VASISTA:-  The greatest gnani: “His state is indescribable yet he will move in the world like anybody else," ..."Though acting after every feeling such as love, hate, fear and the like, he who stands unaffected within is said to be real jivanmukta." Sankara's commentary.

Yoga Vasista says of the Gnani: "He is a great worker." It also so says, that he keeps his body healthy, does not starve it.

People speak of getting rid of conditioning or samskara but they themselves are unaware of the fact that, the universe in which they exist is product of the inborn samskara or conditioning.  The ignorance is cause of the inborn samskara or conditioning which present as ‘I’ or ‘I AM’. 

The real Moksha or freedom is   to realize the fact that ‘I’ consciousness is mere physical awareness. Physical awareness is not self-awareness. The self –awareness is   when the formless soul or consciousness remains aware of its own non-dual   true nature. – FORMLESS PATH