I'm not so sure, S1E, about the durability or longevity of NZ's eastbound schedule.
It is fact that it has consistently underperformed and NZ's CEO is on record as having declared the route "at risk."
With route incentives underwriting a move up to MAN, it could, it might make the move viable.
I did say smoke and mirrors, but I do believe efforts are bring made.
Rgds