Killing Stanley and Gil

[Steel]

I've seen a lot of conflicting guides out there. I always save the sisters. And saved Grace. If I kill Stanley, and put Gil out of his misery. Does any aspect of the multi tier ending change than if I were to save those last two? Any dialog changes? If someone that has tried both options could clear this up for me. Or has a great video to show.

[Fauxnel]

HEAVY SPOILERS AHEAD:

Think of the Ending as two Seperate Endings rather than a singular one: There are four endings where Sofia Lamb is concerned, and 4 where little sisters are concerned. It is the same NEUTRAL ending for both scenarios where you either kill one NPC + save all little sisters OR don't kill any NPCs + harvest one little sister EXCEPT for one minor change: the Eleanor monologue narrating Sofia Lamb's fate. If you go for the former ending described above, Sofia Lamb dies and you get this sweet monologue from Eleanor about how she was a butterfly in a coccoon and only by killing her mother is she finally free of it ! If you choose the latter, Eleanor doesn't kill her mother, but she will state that good and evil are tidal waves, ever shifting! That killing her mother would be swift, keeping her alive would guarantee that she will grow old and die knowing that she was rejected by her own daughter. You still get the same double choice Neutral ending afterwards (whether you harvest one little sister or not seems to have no effect on that, you still get to choose). You'd know you've got the worst possible ending (with no choice) when After the Sofia Lamb bit (where she has to die), Eleanor appears muddy with an apocalyptic purple sky behind her back talking about her world domination plans lol

[Sirius4srs]

If you save all the little sisters and don't kill any one of those three (Grace, Stanley, OR Gil, even though he begs you to), not only is there an achievement associated with it, but during the end scene, Elanor will save her mother's life, and the dialogue she gives will be about everyone deserving a chance for redemption/forgiveness.

[Steel]

Strange. I let Stanley go. And killed Gil, that story was too sad, it felt super cruel to keep him alive like that. I saved all the sisters. I got the ending where Eleanor saves her mother, she did not say anything about watching her grow old being rejected. She was actually sweet about it. When Delta died, It was nice weather, Eleanor crossed Delta's hands on his chest with some sweet words, took his ADAM. All the little sisters were there, one gave a Delta doll to Eleanor, and she dropped it into the sea. So I guess that was the really good ending, And I killed Gil

[Fauxnel]

Originally posted by Steel:

Strange. I let Stanley go. And killed Gil, that story was too sad, it felt super cruel to keep him alive like that. I saved all the sisters. I got the ending where Eleanor saves her mother, she did not say anything about watching her grow old being rejected. She was actually sweet about it. When Delta died, It was nice weather, Eleanor crossed Delta's hands on his chest with some sweet words, took his ADAM. All the little sisters were there, one gave a Delta doll to Eleanor, and she dropped it into the sea. So I guess that was the really good ending, And I killed Gil

That's a bug that happened back when Bioshock 2 had just released, where they thought Killing Gil was actually a good choice. It still occurs to this day, I managed to reproduce it not long ago, by going out of Gil's laboratory, not pushing the draining lever, and coming back to kill him (guess the game still records that you didn't kill him even though you return to push the button). I did the same maneuver in another playthrough not long after that, and I got the Neutral Ending where Sofia dies, so that time the game recorded Gil as being dead. Anyways, game gets hidden patches every now and then and it's quite buggy in terms of Endings.
You've got the best ending. You'd know when you get the Neutral Ending where Sofia lives/dies. There are still videos on Youtube to help you out if you still want to watch the endings without replaying the game.