About Mann, what does he want exactly?
Sabotage the entire mission and just head home OR being rescued, leave the planet, join the expedition and help with plan B?
The former feels so clichè , but the latter seems pretty difficult to achieve once you start murdering people here and there.
About Amelia at the end, why is Cooper the only one who can help her out?
I understand humans made colonies around Saturn and the wormhole, but are they saying NO ONE took a ship and traveled to check on the new planets while they were building all that stuff?