Aiken

[KLarson]

I believe that no one could have saved Mary except for, and this is a big maybe,
Revered Johnson. But he left her fate in Aiken and Campbell's hands. He really abandoned her. Now that we know they were not junior partners in Johnson's practice, it is really curious that Mary chose them. All of those who hanged were part of the conspiracy during the days leading up to the assassination. No one will quibble about the guilt of the other three who hanged with Mary, and Mudd seemingly had not seen Booth for months until he showed up at his door after the murder. Mary was helpful right up to the assassination.
So, Aiken's loyalty matters of course, and The mystery certainly makes him more interesting. And if Mary chose him because of his questionable loyalty, it only confirms her own sympathies, which I don't think anyone's questions. Aiken's skill as an attorney matters more, but as I said, I can't be convinced completely that even Reverdy Johnson could have saved her.