In a perfect world, Vaughn would be able to play outfield or somewhere other than first base. But that doesn't seem to be the case. Even so, there's no reason not to take him if the Sox deem him the best player available. Guys like Sheets/Burger/Collins might not pan out anyway, and if they do, they would have trade value that the Sox could use to acquire someone that fills a position of need. Basically my point is that the Sox shouldn't pass on Vaughn if he's the best option just because he plays first base.