I think HND and EZE are red herrings in this as any guarantees are only about route transfers not about new routes. The single NRT being changed to the 777 and NF would be a sensible commercial decision allowing crewing flexibility between the 2 Tokyo destinations.
A single route going over to MF is hardly indicative of a policy to strip lucrative destinations from CTC. MF will have to be employed somewhere and they will be used where it makes commercial sense.
If BASSA had allowed CTC crew to look at hourly pay a few years ago then no routes would be "premium" routes, they would just be routes.