Well, that would have a bit of a peculiar message in it, wouldn’t it? Add to that I simply couldn’t feasibly imagine Sylvanas doing anything good to do with Arthas, even though I may be putting too much faith in Blizzard.
It would be nice to see Sylvanas sidelined, given how egotistical she is. I would say that if they give Sylvie some buildup to betraying the Jailer, it would be quite a helpful alteration of the current sequence of roller coaster plotlines where everything happens at once. However, it should simultaneously be kept in mind that Blizzard does seem to prefer the roller coaster, specifically focused on the “oomph” moments. I do figure not having Sylvie betray the Jailer after her fight in SoD could reduce the oomph of the aftermath of the fight.
Then again, I must emphasize I still prefer the latter, despite the latter seeming more Blizzardesque. If it were the former,
that could indicate a positive alteration in Blizzard’s general collective skills of story composition. Overall, the current lot have surprisingly improved from their prior state circa 9.1., so I have some (minimal) faith in the writers.
Conversely, I still could feasibly see them doing a redemption in which the victim of a genocide is forced to forgive the person responsible for her genocide to make up for her own genocide. Although it would give some relatively sufficient equivalent exchange for her potential redemption, it would still be pretty awkward, which sadly isn’t far off from Blizzard’s usual standard.