Smit took their money and claimed they were innocent. I'm not sure how claiming the garrote was manufactured at the scene of the murder excludes any Ramsey. To me it includes them, especially the person who knew where the paint brushes were kept.
And as for the detective claiming because it was a vicious crime that Patsy is excluded is bull. There have been plenty of vicious crimes commited against children by their monthers; Andrea Yates, Susan Smith, Casey Anthony etc. Perpetuating the myth that females don't kill violently just allows more females to skate on murders they commit.
With regards to the ransom note, John Ramsey was excluded as the writer but no one could ever say that Patsy wasn't the writer, no matter how many writing samples she gave them.