This prove yourself in the lower leagues is bullshit thinking from 100 years ago and belongs in the past. people like Beckenbauer, Dalglish, were brilliant managers straight from the get go. The best manager in the world cut his teeth as a coach. The next best, Zidane was also a reserve team coach. Some people have it. And if an individual has the the ability and is recognized as such by his peers it is stupid to pass it up just to make sure he can cut it the lower tier of the English leagues. We don't expect that from top players so why do it to managers?
How many players have come pretty much straight from playing at top club, got the top job and made a success of it? It's bullshit, people mention Guardiola, Dalglish and Zidane but they're the exception rather than norm. Far too many blue tinted glasses on.