I still think teams are over-rated at the TdF. Sure you need strong TTers for the TTT (which Garmin had), but when it comes to the crunch in the hills, it is more often than not every man for himself. Not convinced team tactics played that big a part there.
One good example from long ago was Lemond in 1989 – he had a rubbish team and was isolated every time the road went up, but still managed to win.
That's for the GC contenders – I'm sure Cav wouldn't have won so much without his team – he would still have won some, just not as many (not convinced he'd lose that many coming off the wheel of another sprinter following his own train, just that some of the breaks might not have been chased down).