I saw a theory that mentioned something about Taylor Walker, but I don’t know how Sloan could be Taylor. Nicole knew her sister Taylor and had a relationship with her. I can’t remember who the original actress was that played Taylor, but Tamara Braun played her for a short time before she became Ava Vitali. Didn’t Taylor die? I remember something about her falling down stairs perhaps in the Dimera mansion. Also, Sloan has an American accent because she is much younger than Colin and grew up in the states. Colin was raised mostly in England and has a British accent. This is not unusual. I had a friend in school who was an American, but had an Australian accent because she spent almost all of her younger years in Australia.
I do think there is a connection between Sloan and Nicole, I just can’t place my finger on what it will be.