I do tend to agree on this.
When I first heard EK diverted to PIK, rather than an EK station such as NCL/MAN, I thought their plan was to bus pax across and road the freight down.
The only thing I can think of, is that as the cargo may have already been airside, they couldnt get clearance to bring it back out of the airport, or maybe there were no truck to move it to PIK?
Bussing pax is one thing, but freight is a little more awkward. Im sure EK had their reasons for doing what they did.
Id bet the pax were bussed up to GLA and then the aircraft positioned empty to GLA though.