Looking into the future .....AKA How full is the flight
Even if Everything is 0 - I mean everything - it doesn't mean the flight WILL be oversold or full or there are OPUPS
IF any airlines would ever Know it - then I would use them for Lottery numbers .
However - LH is extremely good at rev management.
And they always oversell Y in Summer on TATL due to lower C bookings.
So - even if Y9M9B9W9S9etc... usually Econ is packed and C is close to full.
But it doesn't mean there are Op-ups - especially not C-F.
And if there are C-F op-up - they definatley go to Status Passangers.
Y-C op ups sometimes are more random.
One option would be to lookin into the LH system - wher eyou can see estimates and booked - and on the day booked, estimates, checked in and boarded ...
So choose a good seat - and be happy when you board - either way.