All anyone has said about Harper is how he has trouble in coverage and is slow and now he is the key to covering one of the fastest TE's in the league? Harper may help out in run support but he won't be covering Davis.
Harper is not nearly as bad in coverage as advertised. He just has bad ball skills. Harper has in fact virtually shut down Vernon Davis twice in his career. Once in 2010 and then again last year. I would be okay with Harper in bracket coverage with someone else over the top. Even single coverage from time to time. Let's just not make it a habit.
I thought the injury report would be much worse than it actually was and I'm pleasantly surprised at that list. We should play well against the 49ers. Stop the run and we can blow them out.