Interestingly, in one of his last interviews before he was murdered, John, when questioned about the genesis and recording of "Across the Universe" said that he felt that Paul would try to sabotage what Lennon regarded as his great songs. He felt that experimental games would be played on songs like "Strawberry Fields Forever", which he never felt was recorded properly. And he aimed that at Paul although he also said they all did it to an extent.
Personally, I just thought it was Lennon paranoia.
Yeah, he recorded most of what ended up on the original album. If you ever get a chance to watch Peter Jackson's documentary "Get Back," it becomes clear that Glyn Johns had a far larger role than the original "Let it be" film showed. It's quite a notch on your resumé to have worked with the Beatles, the Stones, the Who, Led Zeppelin, the Eagles.....and Joan Armatrading. 😼