Prick Ears and Color and Attitude

I have a female JRT who is almost two and we just took in a second JRT who is four. Their first meeting was explosive! They calmed down a little through the night, but they still don't seem to like each other; we just got Billy last night, will he and Pepper eventually meld?

Also, BOTH dogs have prick ears; I know this means they can't be registered, but I get irritated when people say that they don't look like JRT's; can you send me some pictures of Prick Eared JRT's?

Lastly, Billy that we just got not only has Prick Ears, but he's mostly black; he (in my opinion) is marked very beautifully having a white chest and tummy and white "boot's" on each foot with the brown patches mixed in here and there. What are the specifications on color for JRT's and how does a mostly black one fit in? I know from what I'm writing that you would question his heritage, but if you could see him, you would know he is all JRT!