Ever since we all began publishing league tables after one round of games, reading too much into early season fixtures has become an increasingly infectious disease. Twelve match days into the Premier League and Nottingham Forest are on their third manager, for goodness sake. After the Manchester United - Everton contest completes the latest set of games, every team will have 26 left. There will be a long, long way to go. So, why does the North London derby somehow feel particularly significant