H,
I've no idea the motives behind this but think WineCollector is likely correct that ESG only wish to satisfy the farmin requirements for the CSG while OIP's short term fortune is fodder to some larger machination.
Though regarding WC' comment about a 4m seam not being commercial .. what if it flowed like the BW West trilateral .. isn't that in ~ 4m of namoi seam?
sg