imo, those songs may have been recorded but as production goes on, and as the theme for the album progresses (nothing stays the same, as ideas come to mind etc...) that perhaps they felt these songs wouldn't fit neatly into the record - if you get what I mean.
Its like in drama, taking a stimulus of something (eg: love) and saying right we'll have this and that and then the actual final presentation turning out to be something that doesn't quite fit together... Its a similar idea for when recording an album
So perhaps, these songs might surface someday