Physicality isn't just about height, it should help obviously but just ask Tom Taiwo, Mark Millar or even Hagi if you will. McCann loses a few headers because of his height but I can't say i've ever seen him as lightweight, doesn't really get pushed around just targeted for long balls from time to time. Williamson's 6ft odds and loses more headers and tackles than McCann so i'm not buying that taller is better.