Beyond the international borders opening the decision to not fly the 380 becomes a commercial decision and therefor a surplus of numbers on that fleet to be actioned as such. That is also in the award. Don't be fooled the company is seeking a variation to min guarantee due to kindness to get others back in seats.
They know dam well they won't be able to keep crews stood down for an excessive period of time so probably have concluded its better to pay them less on a variation on other fleets than to pay full 380 MGH to stay at home and do nothing. Which makes sense.