Most of what you're seeing there is value relative to position. Vaughn gets dinged something like 20 runs just being a 1st baseman relative to a catcher. And catchers get a massive positional bonus on the other end. I'm not sure if FGs publishes their positional value calculations but it's certainly pretty close to the traditional defensive spectrum with 1B and DH heavily penalized and CF, SS and C heavily rewarded.
This is dated but is a good explanation. I think the values are much more extreme now.