I can't tell you anything about the horse but I looked up Suki's thread to see what you were talking about as I too have been to Arlington Park, back in July. I also have one photo of the horse you are looking for. I can't tell you anything about him, I have no idea who owns him, or what his current name is, but I can say he looked relaxed and happy and was an eye-catching fellow.

I hope you are able to find out more about him.