Goalkeepers are different. In every other position, there is a sense that competition is a positive. You have a good centre-forward? Bring in another one who might prove to be very good, or whose presence might motivate the incumbent to become even better. But when Arsenal boss Mikel Arteta signed David Raya from Brentford, there was a feeling he had somehow breached one of football’s sacred codes.
Part of the problem is that there is no massaging this. There can be no pretence that
