Players can perform over their XG but it's really interesting, as far as I understand it, how often players revert to mean on XG. It turns out that the only tactical piece of advice our old football coach at school, a ruby man through and through, ever gave us, was bang on, 'if you don't shoot, you don't score'. Goal scoring is much more about shooting (at the right times, in the right places) than how good you are at shooting.