Looking back, Contador could've been leading the race, if he would've raced conscious of his current physical condition. He knew he was undertrained and didn't have competition in his legs. Instead he approached the race as if he was the same as in Giro 2011. He also made few mistakes, such as Jaca losing 18 sec. So if he would've accepted than he could only sustain short and devastating attacks, he would've gapped Purito, at least a couple of times. Basically beating Purito at his own game.
Contador is the only guy who has been able to create a quick and big gap in just few seconds (I don't know how many times I heard the RTVE guys saying "Y Alberto está abriendo hueco"). However, he was not able to do the same in Cuitu Negru, prompting me to think he's tired, and that he maybe has peaked. However, being only at 28 sec. from Rodriguez and having all those bonus seconds available, he's still in theory within striking distance of the man in rojo.