Where the song "You're All I Need" is concerned, would Marvin have said quietly at one point [[easy to hear on the stereo mix) "Tammi listen" if it was not Tammi? I say this as in older threads a contrast was drawn with the new songs on the Easy album where they do not sing their names as on the their first and second album together.

Perhaps they only sung each other's names when recording together and that when it came to the Easy sessions they recorded the songs separately.