Evans is fueled by his heart and passion and i truly believe that that's what makes him great in some decisive TTs. obviously he also has the talent. unfortunately for him, Contador has proved times and times again what heart and passion mixed with unique talent can do.
Evans is fragile even if physically robust. contador is tougher as they can get and has the unrivaled talent to build an amazing arsenal. I truly believe that some TTs (after 3 weeks, specially long ones. it doesn't matter if going up or down.) are a matter of mental toughness and when evans finds himself like he did this year at the tour, he is the toughest guy around, with the exception of alberto. I don't see where evans is better at TT against contador. i don't see who is better cyclist than contador. seriously.
The only thing that i see in evans' arsenal that is better than contador's equivalent is sprinting, mainly because of his more robust physique. both have no technique, so muscle is important while sprinting. still, even at sprint, contador can beat cadel.