From a spectator's perspective, JA has excelled in the rolling hills. He shocked the cycling world in the ITT. He has stayed with the best of 'em in the flat sprints, and yes ...even in the mountainous stages (so far).
The question is...why wouldn't he have a legitimate shot at this whole shebang??
Is it just a matter of his endurance being questioned? Because if that's it, seems to me he's one driven and determined competitor, that's in tip-top shape.
I'd say if he doesn't have some kind of misfortune, it's gonna be mighty hard to pry that yellow jersey off his back.