Please find a very important conversation where Jayadvaita Swami states that establishment of Bhagavad Gita as it is [1972 edition] is done by Srila Prabhupada.
Srila Prabhupāda: So this is the position. The whole Vṛndāvana is full of Māyāvādīs. We have to be very, very cautious and careful. I was there. That Brahmānanda protested against that Aurobindo. And then “Don’t speak of Gītā.”
Tamāla Kṛṣṇa: Yes, that’s what they told him.Jayādvaita: They shouldn’t speak of Gītā. They should speak of whatever other thing they want.
Tamāla Kṛṣṇa: Then why call it Gītā-pratiṣṭhāna?
Jayādvaita: That’s Prabhupāda’s promise. He’s establishing Bhagavad-gītā.
Srila Prabhupāda: Eh?
Jayādvaita: The actual establishment of Bhagavad-gītā is being done by Your Divine Grace. They should admit that, “We have our philosophy, but as far as Bhagavad-gītā goes, Śrīla Prabhupāda is establishing it all over the world. We have something else, our own idea.” They can say that.
Srila Prabhupāda: Now find out the way how to stop this class of men speaking in our halls.[Room Conversation 1-VRNDAVAN – November 03, 1977 ]
This shows that the Bhagavad Gita as it is 1972 edition] was and is already potent enough and its establishment is already done, so there is no need for its editing.
This is a solid proof that shows the editors themselves knew that 72 edition was the only bona fide original established edition.
Srila Prabhupada Receives the First Big 1972 Original Bhagavad Gita As It Is
by Nanda Kumar Das
One day, when I was first with His Divine Grace in L.A., Brahmananda Prabhu came from New York and they were talking about the printing of a Bhagavad Gita with Sanskrit included. Evidently, there was a question as to whether the western people could pronounce the transliteration with diacritic marks.
Srila Prabhupad rang his bell, and I came into his room. Brahmananda was there. Srila Prabhupad handed me a paper with Sanskrit transliteration and said “Read this!” I have been able to read since I was three, so evidently, I made the pronunciations close enough. Srila Prabhupad said to Brahmananda, with great enthusiasm, “See! I told you they could do it!” He was very happy.
So the printing went on, and in New York, when His Divine Grace was there, Brahmananda brought in the first edition of the big Gita with all the Sanskrit in it. Remembering the LA experience, he very kindly gave the Gita to me, and said “Here, you can give this to Srila Prabhupad.” I was overjoyed, and went to His room to offer it to Him, followed by a photographer. I gave it to Him and said “Here is the first copy of Your new Bhagavad Gita, Srila Prabhupad.”
In His amazing way of innocence and childlike excitement, He took it and held it to His head, saying “Jai! Jai!” It was awesome to be present for such an important and empowering moment. Srila Prabhupad was so kind to me. Even though I was/am a deeply entrenched rascal, He has engaged me so many times in wonderful service. All Glories to Srila Prabhupad!
Nanda Kumar Das