What Nat has done this season has been remarkable. However if we have serious aspirations of winning league or CL next season I don't see why we would want him higher than 6th choice behind five much more mobile options. If we go back to defending on the halfway line he would be too exposed and would put massive onus on the other centre back to be on the cover, which leaves us very vulnerable. To play the way Jurgen wants us to the centre backs have to be big, very mobile and good on the ball. At best he is big and ok on ball.
None of that takes away from everything he has contributed this season