[denizen467]

^ That has to be an inaccuracy in the diagram; it would be a weird tradeoff to give up the entire west side of Concourse G just for one additional T2 widebody.

The idea of making T5 a low-cost terminal is tantalizing, as it's aging and isolated, and other airports often site LCCs in a separated, slightly less convenient area. So, plan T2 so that eventually (after some phases) it will house all international arrivals and foreign carriers. If T5 doesn't get filled up by LCCs, maybe it also could be a mini Skyteam hub.