The bike that Stoner did really well on doesn't exist anymore and it never will. Many changes have happened since then.
Even if Stoner came back next year on a Duc, i highly doubt he'll do any better than Rossi did unless Ducati redesigns the bike completely to make it on par with the Hondas and Yamahas.
Even if Stoner came back next year on a Duc, i highly doubt he'll do any better than Rossi did unless Ducati redesigns the bike completely to make it on par with the Hondas and Yamahas.