Houston Texans coach Bill O’Brien said Tuesday during the NFL consolidate that he’s giving over playcalling duties to offensive coordinator Tim Kelly next season. “[Kelly is] a bright guy,” O’Brien said. “He’s a really good coach. Players respect him. He just does a great job. Great knowledge of the whole offense from the passing game to the running game.” O’Brien, who was given the extra title of general manager of the Texans a month ago, had been calling the offensive