Shinichi's daydream

Today, I'd like to discuss some hints as to who I think is the boss of the Black Organization.
The first three facts I will senarai are sourced from The Case Closedjavascript:mox(); Casebook: An Essential Guide. The book claims that Gosho Aoyama has said:

The Name of "That Person" has already appeared in the Manga in some form. This could imply, and makes it likely that this person is a frequently appearing person, setting off rumors as logical and as silly as can be.
Haibara would be shocked. sejak this, we can imply :
the boss is close to Ai.
this could mean she does not expect the character to be...