Bishop
Les Ferdinand
Ok I misunderstood your initial comment. However Barcelona for example absolutely do have a set system that a coach must conform to. Their system and structure has been set for decades all the way through the juvenil structures, it's why A Yamal or Blade or a Cubarsi can come and slot straight in whether the coach is a Xavi or a Flick. A Thomas Frank for example couldn't get the Barcelona job and then decide he wanted to play long ball, he would probably get sacked with weeks. Bayern Munich aren't much different, they again have a set of parameters to which a coach must meet. Ajax the same. As I said that's even the case some what with Madrid but they are more chameleon like and will adjust around the current players they have more than the coach but will give the coach a decent amount of leeway to structure his team.
Barcelona are quite like Brighton, in fact I'd argue it's Brighton who are trying to replicate the Barcelona/Ajax model at a lower profile. At Barcelona the coach isn't a replaceable cog until he is; xavi, Koeman, Valverde, Martino, Reach etc are all examples of this and Barca absolutely do buy young and sell on, it's just that as an elite club and at the very top of the tree they get to keep the very best and player trade the rest who don't quite make it.