Yeah, but he was clearly still unsure about himself vs. froome. It's out of character for Contador to sit on so long, but he's done that with Froome after getting schooled last year (remember as early as Oman 2013 when Conti launched an attack and then Froome just countered and left him in the dust?) So it makes sense, especially given his advantage - Froome HAS to work to gain time on others, Contador does not. If Contador sits on like he did, best case scenario is what happened. Worst-case scenario is that he hangs on Froome's wheel for as long as possible and loses the least amount of time. It would be stupid to tamper with that by attacking too early, blowing up, and losing the Vuelta to Froome. So his wheelsucking is more understandable than, say, Purito and Valv yesterday.