Just remember May when Paul said: "Unless you all want us to give Red Bull the tyres to win the championship. It's pretty clear. If we did that, there would be one team that would benefit and it would be them."
Pirelli was forced to change the tyres in Barcelona, in Germany and Hockenheim and not to mention that they went into a cautious mode and bring everywhere much harder tyres they wanted beforehand.
Interestingely RB started showing dominant and superior form from Germany. That's the time when Lotus and Ferrari massively lost from their tyre management.