[bn2cardz]

I was thinking about it last night while reading through the past posts.
1) Why would blank backs try to be associated with another set if it isn't possible on some (like McLean). Just like a Blank Back t206 isn't associated with piedmont. Since the E sets are defined mainly by their backs to determine what designation it has then why aren't blank backs just considered their own E set?

2) If this Krause is the only confimred e90-1 is it possible that Krause image was intended for issuance with another set with various blank backs associated with it (like e92), but he was pulled before the backs were printed?