I am new here and far from adequetly informed about these 1890 Chicago Pirates cards. But, I came to the conclusion that it wasn't a baseball player for a couple of reasons.
The first thing I noticed was it doesn't have the writing above the portrait that I saw on all the other graded examples I looked at, that there was a red flag.
I looked at the team portrait and I didn't think I saw him. I used the hair style as a clue I know duffy used one similar later on in his career but if you look at his picture on the portrait they are clearly different players. The only player on the team card with the same hair is Arlie Latham and there is an example of his card on google images.
Im really curious what everyone else thought about the card.
I think you are wrong on locating Silver King in the card also, unless I am mixing up your explanation. Here is a picture I found that is easier to identify the players.
http://www.google.com/imgres?q=1890+...1t:429,r:5,s:0