You will find the specific mining work/contracts will need to be Network operated, not operated by Alliance for network. I understand some contracts do specify that QF and VA mainline are able to conduct some of the mining work alongside its subsidiary, if required, generally in the form of a 737NG.
The ACCC clearly delayed the decision as Rex put in a late submission, endorsing the deal, while everyone else had lengthy submissions against it. No doubt that intrigued the commission. Rex will be doing what works for itself, so clearly that supportive submission works for itself, who cares about Qantas. I expect nothing less from them.