I have been told VA have a company wide freeze on hiring externally for ANY advertised positions (including flight crew) therefore VARA will get preference as they are within the VA group even though not on VA mainlines seniority list.
also with the leaving of 8 crfos recently to vanz and the remaining crfos numbers down to a minimum on the 777 they probably cant afford to let anymore crfos go to either VAA or VANZ, therefore maybe the remainding 737 FO positions will go to some lucky VARA guys...