Alberto can not be overcome right now. He is the total package.
He TTs not just fast, but confident in his power over distance. His climbing is equally terrifying. On Verbier he had a VAM of almost 1900, estimated at a 6.7 W/kg output, on a switchback, alternating wind, moderate gradient course. Aside from accelerations, he brings the real sustainable power.
Above all, those things build the necessary psychological barrier that keeps the other players in check. It means his mere presence keeps attacks down, essentially putting him in control. With TT ability in addition, he'll just nip time from everyone climbing (if not destroy the field like in Andorra) and then TT the rest.
The most powerful asset Armstrong possessed was what people believed he was capable of, the fear of that. The closest Ulrich and the rest ever came to unseating him was when they believed Armstrong was vulnerable in 2003. They should have hammered him the day after the ITT "dehydration", but did not and LA recovered enough by stg 15.
Team? Anything will feel more supportive than this last year.
Possessing the psychological edge and then being able to deliver, Contador will have to fail himself somehow (physically bad day, crash, etc.), for someone to beat him, AS or anyone else.