People seem to think Mara Jade has some kind of secret following among the common folk that won’t require any kind of explanation about who she is, just adding her will make an instant hit. Meanwhile in the Doctor Who thread, people were telling stories about educating people who Spock is, who actually has a cultural impact.
I’m fully aware most people have no idea who she is, but adding her in wouldn’t require that much explanation, especially if she’s missing/dead by the ST days and it doesn’t matter who she is.