ravens said:
If he happens to beat AC, it won't be by a 'fair and square' competition on the road, ie, illness, injury, crash or mishap, or by 'other means' [dramatic music swells]. I wonder to what extent he seriously believes he could beat AC 'straight up'.
Armstrong was quoted after the Tour in one of the issues of either Cycle Sport or Pro Cycling that he would've taken advantage of some of Contador's weaker moments if they weren't on the same team.

The only point I can think of when I saw a hint of Contador doing anything close to suffering when Armstrong was in the general vicinity was when he grimaced while on camera on Ventoux.
With Kloeden and Leipheimer, he has 2 riders that can't be allowed to get away on the climbs in a break/attack. The problem with this strategy is that all the other teams with "contenders" have to feel the same threat that Contador/Astana will when anyone that has the rep for being able to podium, & takes a flyer off the front.
Leipheimer has made it clear that he still holds out hope that somehow he will be able to sneak in under the radar and steal a Tour victory away. That is why he stays with Bruyneel and Armstrong because he feels they give him the best chance to finish high in the gc, considering how he's faltered when given sole leadership of a team in the past (Rabobank, Gerolsteiner) and to a lesser degree, Discovery 2008, plus the 2009 Giro with Astana.
Kloeden on the other hand is content as long as his team wins and he has fun doing it. He will not hesitate to sacrifice his own ambitions for his designated team leader. He is Armstrong's dream come true.