Board Thread:Rant and Rave/@comment-25733960-20180519054612/@comment-25733960-20180519221825

And the Mr Gold thing was not addressed at all.

W!Rumple said the Darkness is shared by them (it wasn't duplicated by the Wish). But if he shared it with Weaver, then that means he also shares it with Mr. Gold, because Mr Gold and Weaver are the same person. So, at this point in the timeline (2017/2018) the Darkness is actually shared by 3 Rumples: Weaver, Mr Gold and W!Rumple.

After Weaver killed himself along with W!Rumple, the Darkness still exists inside Mr Gold. So, they actually didn't destroy the Darkness, they just trapped it in an endless loop that would go like this

Weaver/W!Rumple die -> all he Darkness goes to Mr Gold -> Belle dies -> Mr Gold goes to the NEF -> He is cursed and becomes Weaver -> W!Rumple appears in HH -> Weaver/W!Rumple die -> all he Darkness goes to Mr Gold -> etc

It would be like saying Darkness can't be destroyed because there has to be a balance between light and Darkness. By definition, one can't exist without the other. So, the Darkness wasn't destoyed, they just put it in a loop where it can't harm anyone anymore.

That would also explain why Weaver could kill himself and go to Heaven despite having his soul tethered to the Dagger: the Darkness just went to another vessel all together