Folks, logical clarity is our friend.
BICEP2 and Keck Array are two separate telescope units at the South Pole. They use exactly the same imaging technique.
(a). If the two telescopes report exactly the same image of exactly the same part of the sky, the image may be an artifact of measurement or truly “on the sky.” We cannot tell without more information.
(b). If the two images are different, they are unambiguously instrumental artifacts. We do not need any more information.
Now compare the skymaps:
Historically, Big Bang cosmologists have talked their way out of a hundred jams. Don’t let them bs their way out of this one!