And some of the many Jews who remained in Babylon might also have helped with the preparations.
I'm very ignorant about all this but weren't there Jews left behind in Jerusalem who could easily have began preparations particularly as they were working class and likely to be the kind to do most of the actual rebuilding / cleaning etc?.
Jeffro Which means Tyre is still a definite failure. And so is Babylon since Hillah occupies the same land with only a small heritage protected area of ruins a few hundred meters across.
Nice one!☺️