Well, being the fastest means winning: if it means something more abstract based on datas, fine, but then it's worthless. Lorenzo's pace has gained meaning last year after he was crowned champion, not before. If Rossi had won it, something which afterall has come very close to being reality, his consistency/adaptability would have been much more meaningful than Lorenzo's pace. Now, leaving all controversy aside (hopefully forever, both from Rossi lovers and haters), since Lorenzo won in 2015, we can say his pace was the defining factor of the championship.
Moral of the story is: data-based overall superior speed doesn't always mean you're the better rider. And Lorenzo has this thing where often when he loses he has to remark it to downgrade other riders (often Rossi's) performance. As much as I think reasonable Rossi fans should understand why a lot of people here have a lot of things against 46, reasonable Rossi "haters" here should understand why such repeated post-race remarks from Lorenzo are perceived as dull. They are dull, just like Rossi's "golden prince" attitude sometimes is kinda dull.