That's quite amazing, given Casey Stoner is 5 years retired (give or take 1800 days) and he tops the time sheets in sketchy conditions, no wonder everybody is talking about it.
Can anybody think of someone who retired for 5 years, in any sport, particularly one where they can't just practice their craft readily, basically long swathes of time away from anything remotely similar, and have the mental focus, muscle memory, skill, and talent to show that they are still the top?
Consider how much the sport and machines, tires, electronics, components, suspension, etc. have changed in 5 years. Riders take an entire season, many rounds of practice and races to understand the nuances of a single element, much less all of them, and given Casey Stoner's frugal laps turned over his testing regimen, this really does indicate he is and remains the only "alien" as the term is used, in MotoGP.
Casey is just that 'mentally strong'. He had the mental strength and balls to flip the bird to the GPfarce infused in every element of the sport, that's admirable integrity, a characteristic rare in life, even less in ........ venture sport promoters masquerading as authentic competition. He turned down millions, didn’t sell-out his principles, and was still presented with the opportunity with top factories to test their state-of-the-art technology. He's happy, collecting a fat check, and with every lap time, a middle finger.
Edit to add: undoubtedly Casey Stoner has been vital to Ducati's improvement and development. Finding the limits, even when the factory riders have not reached it, is information that would otherwise be impossible to uncover.
If you live in a glass house don't throw rocks.