Just a thought:
I have a feeling bourbon has played an active role in the background of cases, if this Toru character is bourbon. Remember the Eye case, where the letter was sent to heiji thought to be written by the killer, but it was never revealed at the end who wrote the letter. I just have a feeling the housekeeper was coaching Conan and Heiji along the way, and was simply too curious. I have another strange feeling there was a reason why that case didn't feel resolved. Maybe bourbon has kept a closer eye on Conan than we thought.
I always wondered why Gosho uses those Gundam references, its a little odd don't you think?