What evidence do you have to that effect? I doubt you can produce any b/c that's not the way it happened.
After Qatar 2008, there was a battle royale in the Ducati garage between Stoner, the factory techs, and Bridgestone. After an 'easy' WC in 2007, Ducati inexplicably decided to re-engineer Casey's bike, and abandon Ducati DNA by beginning carbon frame development. Bridgestone stopped delivering Casey's 2007-spec tires. Rumors started at Jerez that Casey was losing his mind, and by China 2008 Casey actually spoke to reporters about Bridgestone's refusal to supply his tires. Casey's apparent motivation to go public was his 2008 race time for the Chinese GP, which had risen compared to 2007. Midway through the 2008 season, we had the introduction of a new Rossi-Stoner front Bridgestone, a tire that had squishy edges. No doubt an attempt to increase the contact patch using F1 tire tech. The new Bstone design philosophy was significant b/c it was the opposite of what they had done with Casey in 2007. Back then, Bstone made a very aggressive profile to increase the size of the contact patch, thus increase the grip of the rubber compound. To cope with the additional cornering forces, the tire carcass was made very hard.
Long story short, all signs, from the emergency tire meetings to the introduction of the control tire, point to a set of regulations that upset Stoner's applecart, rather than passing Stoner's tech to the entire paddock. They already had access in 2007, but most riders complained that his stuff was unrideable. To this day, the entire paddock wants to transition away from Stoner's beloved code-24 Bridgestone, BUT Bridgestone have been resistant. With HRC backing, Bstone have preserved the 24 and created a new softer-carcass 21 with identical performance to the 24 (good job Bstone).
Tires started the downward spiral of MotoGP, including Kawasaki's withdrawal after their 2008 offensive was thwarted by shifting tire regs. Tire design was revolutionized by the fuel rules. If pursuit of minimum lap time is the goal, braking wastes time and energy. In an energy shortage, braking or acceleration will have to give. Honda/Yam/Michelin bet acceleration would give (spring valve engines). Ducati/Bridgestone worked to eliminate braking by raising corner entry speed. The tumult that ensued can hardly be classified as beneficial for anyone.