What would the path be had you been able to contain the light?

[Jandor]

Anyway, as for Emet, I'd say that he never had any plans past that hypothetical, for it was never possible for that to come to pass. It simply wasn't in the cards. I'd also posit that not even an Ancient could conceivably hold all the Light. It's not just Aether, its corruptive aether. Also, have we already forgotten that the first Lightwarden was an Ascian? If we were 9/14ths, I'd say there's a good chance an Unsundered would be equally imperiled by the Light.

To be fair, that was an Ascian raised up from one of the sundered. I don't think being restored to office makes your soul any denser.

We do at least know that an unsundered cannot contain the light when it's thrown at them in Axe form though.