ZEN Satori is not highest Advaitic or non-dualistic Gnana.+

Nothingness is an erroneous conclusion because every thought has its opposite every word is tied to its coordinate for all thought and speech can only operate under such dualism. Hence, taking the most fundamental word, existence its implied opposite non-existence is also there, and vice versa. So nothingness or “non-entity" is meaningless without "entity". Both are there.

Buddhist Idealism: speaks only of ideas. But they are unaware of the knower of these ideas? It is a thought. The thinker of these thoughts is part of the dualistic illusion without the thinker there are no thoughts. Without form, time, and space there is no thinker.

The Bhagavan Buddha was asked by one of his students, "Are you the Messiah?"

"No", answered Bhagavan Buddha. 

"Then are you a healer?"

"No", Bhagavan Buddha replied. 

"Then are you a teacher?" the student persisted. 

"No, I am not a teacher."

"Then what are you?" asked the student, exasperated. 

"I am awake", Bhagavan Buddha replied.

Bhagavan Buddha said:~ Buddha is not a man, but a state. I have found the way. Enter all of you!

Bhagavan Buddha kept silent, refusing to answer questions about the ultimate. Therefore,  he was the wisest man in refusing to commit himself.

ZEN Satori is not the highest Advaitic or non-dualistic Gnana because it comes as flashes, it does not depend on seeing the world and does not depend upon the mental sharpness so much as intuition. Zen Buddhists are only mystics--they do not offer proof. How is their main method different from that of Christian mystics, Hindu mystics, all of whom do not seek to prove by reason, but by "I know," intuition?

Zen is quite alright in mentioning the nonduality: it is the nearest to Advaita, but nevertheless, it is still inferior because it fails to prove non-duality, it illogically gives loan exercises as a means of attaining that which is beyond attainment, because always here, and it talks of insight or intuition to see Reality when sight involves a second thing, duality.

Zen gives a high important place to meditation practice. The truth is that Zen advocates the necessity of meditation for those of its adherents who cannot grasp the absolute truth.

ZEN is also on this lower stage of Yoga because it depends on flashes of Intuition gained by meditation, not by reasoning.

Bhagavan Buddha gave up his austerities of yoga as impossible and useless. (Page.70/71 "Buddhism in Translation” by Warren)

Bhagavan Buddha got enlightenment only after he gave up Yoga. Unless one exercises his reason--there is no chance of getting the truth.

When one says "Nothing is" what is the meaning of "is"? "Nothingness” is something that exists: one cannot prove that consciousness does not exist.

Has the Void a meaning? If so then it is only your imagination.  Buddha gave up yoga after practicing it for six years. He saw it could not yield truth.

The 'Void' of the emptiness of Buddhism is only a stage. It cannot be ultimate. It says there is really nothing. The mistake of Hinayana Buddhism is to jump to assumptions where Buddha kept silent. :~Santthosh Kumaar