Does it matter that four justices voted the right way? Nope. Obamacare got passed.
You're under this illusion that these other justices wouldn't have voted for it if their vote had mattered. If Roberts hadn't taken one for the team, I assure you someone else would have. They vote against it only to maintain appearances.
The Supreme Court is as much of a scam and theater as the other two branches of Congress.
That simply isn't true at all. There were reports that Kennedy lobbied Roberts hard for over two months, trying to convince him to join the conservatives and strike down Obamacare in it's entirety. Had Roberts joined the other four conservatives, the entire law would've been struck down.