Gents,
It's nothing to do with ability.The Emirates 380 transistion course in use at the moment is Airbus developed only for crews moving from A340-500.This is approved by the GCAA and allows a reduction in course time by 40%-and associated costs.This was an entry into sevice cost saving measure and is unique to EK as they operate the A340-500 which is very close from a crews perspective to the 380.
When Emirates move to a full transistion course then previous type becomes irrevelant but cost constraints may hold that back for a while.