It does not, but it shows how much of a stalwart Kompany is in City's defence and how he helps the keep clean sheets.
It's not only his ability in defence, his leadership skills he possesses which is something Vidic lacks.
Rio is United's best defender when fit by miles. This is something that most United season ticket holders admit, who see there team play live each week.
I think it also has to do with tactics, his role is more prominent and also perhaps slightly less difficult due to the Mancini's tactics.
Of course comparing two CBs, the brain and the brawn as it were, is essentially pointless Rio and Vidic aren't carbon copies of each other especially in their Role. It wouldn't surprise me given the season ticket holders I know. I really do not think Rio is better than Vidic, he might seem to be more important as the 'leader' but for me Vidic is the best.
Rio isn't as tough as Vidic and Vidic isn't as smart as Rio. Rio is definitely not all things at all times, he's a very good defender yes, but play Rio-Jones for a bit and Vidic's quality will become blatantly apparent.