RC, how much of these lap records might we contribute to the progression of the GP bike? ( improved power delivery, Aero package, chassis and swingarm development, etc.)
If you live in a glass house don't throw rocks.
I don’t think anyone can attribute a given percentage to any particular part. They are all interlinked. I remember Tech 3 having a very bad year the year after the switch to Michelin and they attributed that to a bike that was built around the Bridgestones. Same story with aero, swing arms etc. they are all designed to compliment the handling characteristics of the bike with a given set of tyres.
If you take a 2018 MotoGP bike and shod it with some 2015 Bridgestones, I am fairly certain the handling would be unpredictable.