Ratty....
The short (and complete) answer is "..that information is not in the public domain".
I think only two bits of information are "out there"...if they are full/correct/to be believed.
1. The DXB Tower recording (make of that what you will)
2. Pilot/eye-witness awaiting departure, reported by Indian newspaper (no name given)
....and there's no indication as to "the why" in those little factoids (if they are correct/full/etc.etc,etc).
That's ya lot I'm afraid.