^That could be one of the pit falls of screwing over your team mate, when you've been told to hold station. If you need them later in the season to keep a title rival behind them, it would be very easy for them to go to wide on a corner and let your rival through. Webber doesn't appear to be a driver that would do that however.
As for Mercedes, yes Nico was faster than Lewis but he played the team game, it is better for the team at this stage in the Championship to pick up as many points as they can and not risk taking each other off. Remember a few years ago when the Red bulls collided with each other and most people say Vettel was to blame for the accident at times it seemed as if we could be seeing a repeat of this when Vettel was trying to get past Webber,