Okay, I'm probably forgetting something to ask, but I think any further questions I'd have about youkaitude would be going in circles.
Definitely want to make sure Draco gets his say before moving on, though, regardless of what there is to add or ask. I might be forgetting something important. Probably.
I don't know where to go/who to talk to next, though I'm inclined to think that this puts hasty youkaidom out of the picture unless we discuss these full implications with Renko. Not sure there's going to be enough time for that.
To me, the next priority would be finding another way to get personal assurance and safety for tomorrow. Talking to Byakuren about the situation in light of these doubts and the ability to discuss (most of) the issue with her is the easy route to this, but running that idea by Renko to see about other people as backup in the morning might work. Of course, trusting them might be an issue...
For that matter, we could use what little spare time we have to try and figure out/find a counter to Alice's stuff, if it must come to that. But what would slow down a dollmaster, or especially a size-enchanted doll? A way to dispel the size might be effective, but much too conspicuous to ask about. And we aren't entirely clear on how her abilities work, either, so it'd be tough to find more subtle or conventional methods without more information.