I watched this video and several others yet I still have some questions -> https://www.youtube.com/watch?v=Cdk_fvXG5xA

• If linking or not linking doesn't make a difference, then what is the point of linking? Only saving the day? Current undeads will be humans and later when the fire starts dying again, humans will be undead again and one of them will be the new linker?

• If you don't link it, then eventually an undead will rise and beat you to link it. Looks like Vendrick was the guy who choose to not link it before us. But it looks like DS2's world is not dark at all? Maybe not enough time passed yet? So, if enough undeads choose not to link it, can the fire go out? Then the circle can be broken?

• Fire Keeper can see the sparks in the darkness when you give her the eyes, is that mean that circle can't be broken? Then what is the point of all 4 endings?

• Is Untended Graves's fire is gone forever? Then is that mean the circle can be broken? The black knights in Untended Graves are the soldiers of the men's age? So men can live without the fire/sun?

And my last question is, can you please explain to me the 3 endings of the DS3? The first one is the typical one (link the fire), but I can't say I understand the other 3.