Digital distribution service Direct2Drive is disputing claims made by competing digital storefront owner Stardock, which recently claimed its Impulse service is second in market share only to Valve’s Steam — but Stardock is restating its initial claims. “Stardock’s recent assessment of its service [that Impulse holds a clear number two position in the digital distribution space] is misinformation at best,” Sutton Trout, Direct2Drive’s VP of digital content said in an email to Gamasutra. “An NPD …