I think this makes a great deal of sense. This is not a common type rating, but allowing crews who have both ratings to fly both types. My airline had a dispensation for some senior pilots to alternate (not daily) between Boeing and Airbus during the period when we were introducing a new fleet. This is actually a lot easier due to the way the Airbus fly by wire handling works. ANA won't be typing all their A320 pilots on the A380. But those that they do can fly more and certainly carry out more landings flying the minibus, rather than the limited experience provided by operating back and forth to Hawai, which was what I heard their A380s were mainly doing.