I think you missed the original post. This is not a straight forward fleet replacement, the initial post states that the VARA crew are being integrated into the VA EBA with leave from the VARA EBA. This means integration of seniority in part and therefore there needs to be negotiation on who is entitled to what. If the VARA EBA was handling the fleet replacement then it would be straight forward. Other things come into play with regards to the whole EBA. Nothing in this is straight forward. Once you merge two pilot groups you then have the other issues of base bidding, leave bidding, roster bidding etc etc...
The up side as alluded earlier is that all the pilots have the same agreement, so no undercutting as per QF group MO.