Nautica and Vince Camuto parent company Authentic Brands Group, emboldened perhaps by BlackRock’s $875 million August investment, is inching closer to finalizing a $270 million offer to snatch bankrupt Barneys New York from the yawning maw of liquidation. Though the brand management firm’s bid could finally write the next chapter in Barneys’ financial melodrama, OC&C Strategy Consultants…