Merc were very unnecessarily risking the finish by waiting to pit so long. As with what happened with Bottas, wear a tyre down too far and you risk damage. Even more so when asking a driver to push at a track like this you lose grip, you slide out more in corners. Other tracks he would end up a little wide, here pushing on very used tires you're risking binning it in the wall. Even had he came out behind Alonso the tires difference even ignoring the car difference would have made it easy.
Now, if he'd have been coming out behind Massa that is different, he's a joker in terms of professional driving and a car with equally high top speed. Against the RBR's and Ferrari Hamilton's only risk was binning it and going so long on that tire risked that heavily. Riccy, Alonso and Vettel weren't any significant risk at all in terms of contact when passing them.
This track is about confidence you can make the corner, when the driver has lost confidence you should pit basically.
Decent race, unlucky on Rosberg, weird that Merc didn't learn from Hamilton at Spa. Then they should have pitted him after 5 laps and that was just with bodywork damage/lack of downforce. With Rosberg's car no electrics, no speed, jumping gears. I thought they'd pit him after 5 laps and realising he hadn't got the pace to pass a freaking Caterham.