From what I've seen of BOR over the last few days, he is not very concerned about the fake memos. Yes, he has implied that they are likely fake, but who doesn't know that? Most of his comments on the matter are dismissive of the opposition to the fake documents and blasting the internet, right-wingers, etc. Plus he as usual throws in his pious "both sides" line. BOR is looking out for himself, and Rather and Kerry to a lesser extent.
His opening segment two night in a row have been about CBS and the forged documents and how CBS is destroying its credibilty.