On a track that demands a great chassis and aero, W09 seems to be fastest when the tyres get in sync with the car. Bottas being so close when Hamilton takes a pole means the car the stable and predictable. There were times when Lewis takes pole, but Bottas would have been struggling and out of top 3, which is more about driving getting the best out of the car to get pole.
So, IF Mercedes get their act right with tyres, then they have a fastest car.
Finally, a season worth watching from a competitive landscape perspective. Champion drivers on almost equal package!