‘There are always questions about NFL quarterbacks. For Buffalo’s Rob Johnson, the questions aren’t about his ability, but rather his durability. The fourth-rated passer in the NFL at 100.4 points, the 6-foot-4, 212-pound Johnson also leads the Bills in rushing with 150 yards. "He’s playing smart football mainly because he’s holding the ball and not throwing interceptions," Dolphins linebacker Zach Thomas said. "That’s what turns games around. It’s not the sacks." Unfortunately for Johnson, he’s been knocked out of five of his 13 career starts heading into Sunday’s 1 p.m. game against the Dolphins at Pro Player Stadium.’