WE know how shitty the Sperados have been, the Salvatores know, the Sperados know, but if the people at trial are going to know, they better have more proof than "because Leslie told us" and speculations! Otherwise, the Sperados will do some asshatted thing to forge information and put on a crying act
Like, I don't doubt that the Duchess has something up her sleeve, but just defaming the Sperados with records of younger siblings being killed is not enough if they say like "well we weren't going to do that." The middle name thing would probably help though, if Leslie doesn't have one