I can't remember if it was him or even King Kenny. I bet Rainey was one of the first riders to really understand what was happening. Is Marky doing this more than the others? One things for sure, he uses shredded tyres better than the rest. I reckon he's very very strong for his size and doesn't weaken over a race distance. So if spinning saves the rear tyre how does he save the front? Do you notice too that he passes on the power diving up the inside more than out braking ? Even if he passes on the brakes he really catches them on the drive. He's passing on the gas on corner entry so maybe that's how he saves the front tyre. Pure conjecture of course as I have no idea what he's doing!