Something to keep in mind is that the BBD article doesn't talk about what ride height they measured the roll center at. Or at least as far as I can tell they didn't, maybe I missed it.
The article is pretty old, so I wouldn't be surprised if it was at a stock ride height. So, while they list a roll center, I would bet it isn't much use comparing them.
Not that you said you were, just an observation.
Also, I wonder how camber gain is affected by initial camber. They started with zero camber and it seems like the norm now is a half to one degree negative chamber for street cars.