Please provide a link to anything published that shows a plan for T6 if R3 is not built.
Wrong Frank.
T3 airlines will move in to an expanded T2.
Correct, the long-term plan is for several phases of expansion, to provide the following total ballpark capacities:
Current T2A/T2B: 20 mppa
+T2E: 30 mppa
+T2D: 40 mppa
+T2C: 50 mppa
Whether and when those all happen is obviously dependent on R3 going ahead. With no R3, the suggestion that T6 needs to be built to accommodate displaced carriers while T3 disappears under the toast-rack is, frankly, ludicrous.
Don't gorget, 5D and 5E have to go somewhere as well. Speculation on my part but wait and see, things change, especially over such a long timespan. Would say more likely than not.
This is a rumour network, the clue's in the name.