This might be nitpicking a bit but this is really bothering me. I think you guys have the whole Reod thing wrong. The Elantrins didn't become "zombies" because the dor was cut off or slowed down. They became zombies because after the chasm was added to landscape the Aon was suddenly INCOMPLETE, thus their transformation into elantrins got "stuck" halfway through. Now I have no idea what would happen if they went to another planet. But they wouldn't become zombies again. That was a very unique set of circumstances. (Which it now seems was orchestrated by odium)
Well, the issue there seemed to be that they were getting the Dor "wrong", or perhaps not enough.
The question is how reliant Elantrians are on the Dor to survive.
Exactly, I never read anything in Elantris that implied they required the Dor OR the Aon that Elantris formed in order to actually survive. They simply received their power ( and for a while their curse ) through it. I feel like if an Elantrin were to venture far enough away from the Elantris aon then they would simply revert back to whatever they would be if the city of Elantris had never been built. Which could very well be the non-glowy guys we saw in the interlude.
The question I ask is that if their powers are so vastly reduced as they travel away from Elantris (that's a fact) then what power are they using to planet-hop? As far as we know there is no actual 17th shard, that's probably just some romantic name that the group came up with. And if they can't use the AonDor, then we have to assume the Elantrins ( if they are indeed Elantrins and not just some random people from Sel) have discovered quite a bit more about the cosmere than they previously knew.