I would argue that only on mega money Sky would those guys be domestiques.
Doesn’t matter though – it’s a team thing, they knew the score when they signed up for it. Helping a member of your team to win overall means extra spoils for everyone.
If they’re not happy, they’re free to look elsewhere at the end of the seaosn but for now, they just have to get on with the job in hand.
Part of the problem is that the mainstream media are talking this up like it’s a ceremonial parade round Italy and Brad gets a nice pink jersey at the end of it. He, and the team, are going to have to fight every inch of the way for this. Only if there is a catastrophic accident for Brad is there going to be any talk of a Plan B of letting one of the other guys run free.
This is pretty much the same way that Lance and US Postal ran – everyone works to get one person over the line first. Problems always arise when you’ve got two leaders or try and do too much (like go for Yellow and Green at the Tour).