Amidst all the hoopla and hilarity of the season's first managerial sacking in the Premiership - Steve Bruce by Sunderland FC - it's easy to lose sight of the fact that it typically doesn't help to sack the manager. To be sure: there often seems to be a bounce-back in results for teams that appoint a new manager; but statistically speaking, the bounce-back is likely to occur in any case, with or without sacking the gaffer.