It occurs to me how, even though it is in a ways 'cute', the vriska is dead and in dream bubbles thing has little impact on the plot and is ultimately pointless.
Then a thought occurs to me, There is one thing Doomed!John knows that we do not, and Vriska would be curious about.
The only chat he's had with 'her'. He's capable of reliving it through memories, in the dreambubble.
We're going to see that chat soon.