Having listened to the two pieces, referencing Mark Lewisohn's book about the quadruple tracking of echo used for John's voice, and that John is hitting notes a little high for his particular register, Its John. I'm pretty certain that if 'Lucy' had been done with as much echo, as high as John's voice is, it would probably be reminiscent of Paul's as well. If you want to believe its Paul, so be it, no harm done. Easy mistake, but its clearly John's voice. Amen.