Mikel Arteta would have learned plenty from Pep Guardiola at Manchester City but nothing more important than having the courage of your convictions.
I was shocked when he signed David Raya last summer because I'd been impressed by Aaron Ramsdale who clearly has many attributes for a goalkeeper, including organisation and leadership.
Arteta backed himself to make the tough decision as Guardiola had once done by ditching England No 1 Joe Hart at City.
I admire it in many ways because if you're a manager and believe there's a player who can improve your team, it's a big thing to trust your judgement when it won't sit well with everybody.