Ok after re-watching I slightly changed my mind, it kind of was more Perez's fault, live it seemed closer - depends mostly on a camera angle (overhead). Certainly not 100% though - car falling apart, tyres, breaking point which were different, Massa's late risky, approach to overtake, too fast and too close. Reprimand only worthy at worst judging by recent and previous decisions (De Resta/Raikkonen Monza 2013). Williams should blame mostly themselves.
The rest the same, most important numbers in case anyone missed or forgot (2nd pitstop):
Rosberg 25.102
Hamilton 23.554
Proof that Mercedes hates Rosberg

and Hamilton's biggest achievement in this GP if you still think he's winning it easily despite losing qualifying, losing first corner and not being able to overtake Rosberg on track despite very competitive strategy. Even with I admit controversial leaving the track circumstances, just being faster on softs does not make an overtake formality.