I think the difference with that is he was groomed from the ground up.
Eat, slept and drank Barcelona, and was in the clubs eco system. Furthermore, he was more of a coach than a manager. The club is run from upstairs, basically told here are your world class players, you coach em.
You want a manager that has experience, which is defined by winning a trophy in a club in any country, failing that you want a manager that is brought up with the club, but you don't want an up and coming manager(unless their name is Laudrup). What you definitely don't want, is who ever our current manager is at the time.
Is that all correct?