If I had to pick I'd say Ngata. If he has his way with Goodwin in 1-on-1 we're in trouble. I will say that I think if/when Boone or Iupati double down on him he'll be neutralized. If we can take care of Ngata that takes care of everyone else, including Ray Lewis. Lewis, like most ILB don't do well when you can effectively run right at them. And this 49ers with Frank Gore and our physical O-line thrives running between the tackles. I predict us running a heavy dose of "wham" plays at Ngata (with Miller, Davis, and Walker) to free our guards to get to the 2nd level.
Outside of Ngata I just don't see us having much of a problem with anyone else.
I am sooooooooo stocked