INDIANAPOLIS >> Takuma Sato learned a tough, painful lesson from his spectacular final lap crash at the 2012 Indianapolis 500.Eventually, it paid dividends.The Japanese driver believes he might not be the defending Indy winner heading into Sunday's race had it not been for the ill-fated passing attempt that sent him spinning hard into the first-turn wall and gave Dario Franchitti his third and final race win six years ago.