Shouldn't Dain be a Noble?

By Captain Poe, in The Lord of the Rings: The Card Game

Dain was a king and all, and of noble blood, as he inherited erebor. Do you think this was an oversight?

Captain Poe said:

Dain was a king and all, and of noble blood, as he inherited erebor. Do you think this was an oversight?

yes i posted a thread on this the other month- brand as well was king, and isnt noble