So basically they were working together in a bungalow in LA in early 2k14. Sir Paul was on the keyboards and Kanye was vocally sketching and shaping ideas in a stream-of-consciousness riff, as you do.
So they're all gathered around, and suddenly Ye—bb Nori on his lap—finds himself singing “Hello, my only one . . . ” but apparently he has NO recollection whatsoever of uttering those words, so in that moment, it was all clear: his late mother, Donda West—mentor, confidante, best friend—spoke through him. “My mom was singing to me, and through me to my daughter,” he said, astonished.
And apparently 'Kanye' means 'only one' so then everyone came to the realisation that a powerful message had been passed down through generations.