Silly comparison. One size doesn't fit all. I've heard stories of Ronaldo and Romario being complete slackers in training but they'd still turn on the magic on match day. Does that mean all players can slack off in training?
Messi's made his bones in football but Jack's just keep on breaking. I say he needs to make lifestyle adjustments because he needs to brush off this bad boy image and everyone seems so keen to fit him into the 'Gazza' mold. Also, he might be one of those players that needs to be more health conscious, train outside of regular hours and see a specialist just to stay fit and have a long career.