Don't really consider myself a Nolanite, but... On the first planet, the previous expedition was likely destroyed by the wall of water. The same tidal wall that could have destroyed the second expedition as well. Thought that was pretty clear.
As for Edmunds, we don't know what happened to them, for all we know they could have crashed.
I'm glad they abandoned that Earth Healing life form, now that sounds stupid to me.
Just kidding about Nolanites.
Huh... how pointing the fact that the tidal wave crashed the ship has anything to do with my time related question?
I was saying that when Coop is supposed to meet Brand on Edmunds planet, Murph says that she just arrived.
They say the same thing about the water planet, that the destroyed ranger arrived minutes before they also landed.
So time passes slower on every planets, even slower as you get near gargantua.
So when the tesserract closes Coop has travelled back/forward actually into earth timeline without suffering any of the time dilatation effect (like they encountered when they flew back from the water planet to the endurance and find the guy 23years older) so when he will travel back to Brand, like it happened on the water planet it will only be seconds/minutes/ hours that Brand has landed.
what killed Edmunds is probably not a crash since there is a colony and if I remember correctly Brand flies with only a ranger.
At first I tough I it couldn't be old age since it would mean that Coop could not reunite with Brand, then I realized I forgot about the final sling shot near gargantua that cost them 51 years.
So After leaving old Murphy space station, Coop will not need to do such a manoeuvre (his ship has all the Power it needs to go trough the whormhole and straight to edmunds planet) when he will arrive on edmunds planet it will be just like he did on the water planet (shorter even since time passes even slower on Edmunds planet) it will be only seconds/minutes/hours after Brand.
Well that made more sense
Sorry I modified as I was remembering stuff