Staying on topic, I'm certain that Levi and Klodi will ride support for Lance until the last climb up Tourmalet. Almost no matter what the standings of riders are to that point. These two riders have a history of shaky confidence, and submissiveness. They each easily could have lead their own teams in the past, very likely to a GT win, and in almost every instance either buckled under to ride for someone else, or faltered in leadership roles - more often than not due to risk-adverse, conservative strategies, but often simply weak leadership skills, or lack of confidence.
So yes, they each may indeed be stronger than Lance, but that doesn't matter. They signed with this team knowing their place. Levi will have a shot at the Tour of California, and Klodi possibly Suisse or German Tours, but both will bow down and ride for Lance in the Tour.
As others have stated though, it won't really matter. Unless AC is hurt, very sick, or pops +, he'll win the 2010 Tour by minutes. And even if he is somehow out, I believe several other riders will finish ahead of Lance, especially with the 2010 route being what it is with no TTT, and many climbing stages. People who still believe that doesn't matter, and Lance will still win must still think it's 2002.