First-year coach Josh Carr says much had to change to fix Port Adelaide's leaky defence. "A lot is different," Carr said after Port's 21-point win against North Melbourne. "And that's not a knock on the past or anything like that. "It's just the philosophy behind it." Port may languish in 15th on the ladder but they're ranked second defensively for scores conceded, behind only pacesetters Sydney. Overall this season, Port concede an average per game of just 78.9 points.