lol true XDxpon wrote: If that old lady can walk.. then Gosho is returning to the very beginning!!!!! (first case!)
Great work at the murder-case like always @chek

My thoughts:
I think the Mystery Lady is more likely to be Yukiko than Fusae.
We don't know anything about Fusae, what her abilities are and what use she can be in the case. But we do know that Yukiko is able to disguise herself and others.
Also, that Mystery Lady confronted Scar Akai who's likely Vermouth. So, if Fusae is an undercover agent, why would she reveal herself to Vermouth? To scare away Vermouth?
That way, Vermouth would be warned that her cover is blown.
If it would be Yukiko tho, then Okiya/Akai can use her ability for disguises to save Shiho. Okiya likely send that message to Haibara to force her to take the APTX (like already said). Once she's big again, they can disguise her. First I thought she might be disguised as Ran or Sonoko (since sonoko was compared to Haibara because of the hair once XD). But since a uniform is missing, they could disguise her as the staff, since the BO is looking for Sherry as a passenger on that train.
Also, Yukiko was friends with Vermouth, so her encountering Vermouth with a "Hi Sharon" etc. would shock Vermouth more. And would pressure Vermouth more too and wouldn't immediately make Vermouth think that she's spotted by the FBI.
Akai also had a photo where the DBs and Yukiko are on it. Jodie/Akai were also there when Conan disguised himself as Haibara. Okiya also lives on Shinichis house, and Yukiko already made a surprise visit once to scare conan too. So it's not impossible for Okiya/Akai to get to know Yukiko and her skills.
Random twist: Yusaku is disguised as Kogoro! *_* XD
Oh yea, anyone else thinks that Ran will see Haibara turning into an adult again? Thus blowing Conans cover? XD
Meanwhile: Gin and Vodka are getting the helicopter because they are bored too wait for the train.