Guy the centralisation of security was a farse designed to funnel passengers through the main duty free shop. Having it where it is now makes it no harder to isolate the two halves of the existing terminal. In fact if you wanted to turn the current western pier, mostly used by Star carriers, Emirates etc it would be dead easy. The walkway connection the 'central' security to the pier could be blocked and the old entrance re-opened. For arrivals again just block the connection between the two arrival halls.
Of course to do this a new facility for Qantas/OneWorld needs to be built, though should be easy too utilising the space occupied by the Qantas maintenance base.
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