"One of my acquaintances joined last month on the B777. He says Emirates has around 220 Aircraft at the moment. 300 by 2016, so how come the commands have slowed down?"
Do the simple Math, the guys getting upgraded between now and 2016 are already in the company and are here a few years already.. for guys joining now command will require a doubling of the fleet, attrition runs at about 3% and the pilot body is quite young so retirements won't be an issue in EK for at least a decade. Upgrade times are getting longer and IMHO that trend will continue.