[X] Godwinson
Reiterating, I think, but just to be safe.
I think that this isn't worth taking a risk on.
First, note that Rionna's power was all about
her own control. Sayaka doesn't "take the reins" on someone else's power; consider that her clones are completely distinct from the clones of the cloneguca she copied. I think that Sayaka will only be able to "take over" Rionna's shades if she straight-up uses Rionna's power on them, in its full-powered "tear soul out of its body and enslave it" mode, and I don't want to make Sayaka do that.
Second, you're assuming that these shades can be "fixed". Note that, while it's almost certain that they're aware and suffering, it's
also possible that they're in a metaphysical state that's far enough gone that they can only be brought back by a Wish.
Third, given that "WHAT IF HER SHADES FADE, THAT WOULD MAKE US A MURDERERRRRRR" had been brought up repeatedly in the lead-up to this update, I think that if we had a way to do anything about it we'd have been given a voting option for it.
Fourth, consider what this would mean for Sayaka's power levels. Firnagzen isn't going to get even
close to offering us a chance to take the powers of a hundred magical girls.
Fifth, even if Sayaka
did manage to take over all of Rionna's shades... think of what that'd do to her. A hundred-plus
actively tortured souls stapled to her gem? Nnnnnope, not doing that to her, she'd suffer every minute of it.
So the expected
reward, as the product of the raw reward value and the probability of that reward, is low.
Compare this to the
cost. Witchbombing Sayaka now would be a gruelling, catastrophically stressful affair, risking horribly negative thread climate at the best of times. Right now, when the leading vote specifically says "vent, snuggle, and de-stress", as a direct result of the thread being locked repeatedly because of people arguing for HARD GIRLS DOING HARD THINGS... I think that we cannot risk another stressful debate right now. Given that the probability of reward is so low, I think that trying to witchbomb Sayaka right now is out of the question.
Well, unless you want to propose an impromptu week-long timestop vacation. I'm always on board with that plan.