When reports emerged a few weeks ago suggesting that only a handful of players are safe from the chop at Manchester United, it was no surprise to see one particular name on the list of survivors. It’s not often the word ‘irreplaceable’ can be used with a degree of authenticity. But this certainly feels like one of those rare occasions. How on earth do you move on without a man who frequently tops the charts in terms of chance creation? A man who, despite not even playing as a centre-forward, has hit double figures in every single one of his Manchester United seasons, and finished as the second…