Maybe
You're wrong, no?
Guardiola had only 1 year at Barcelona B before starting to coach Messi and co.They don't respect the trade.
Not one of them has served an apprenticeship.
Wenger spent a total of 6 years working as a youth coach and then as an assistant manager.
Favre spent a total of 4 years working with youth players. In fact, Favre opted to take a step back and work as an academy manager, despite having already worked as a manager, something which speaks to his maturity in wanting to develop a more holistic understanding of how football clubs operate.
Across 10 years, Mourinho worked as a school coach, youth coach, assistant manager, scout, and as an interpreter.
By comparison, both Neville and Henry walked into top jobs after working as part time assistant managers for a national team.
Absolute joke.