But every first round trade (except for the last Patriots trade) involved another first round pick, which the Niners didn't have anymore.

I think a lot of us would have panned the Niners if they moved next year's #1 to pick up Oher in the late teens, early 20's.

And with Rey Maualuga - they were so close to getting him in the second - hard to pull the trigger to move up a couple of spots if it means giving up a 5th round. Although I would suppose that would have meant essentially trading McKillon for Maualuga.