From my point of view, it is not the coach who becomes world champion, it is a team. Not just the players who played, but the whole squad, and also the team behind the team. Because if you want to achieve success, the whole team has to work perfectly, like a machine, and all the pieces of the puzzle need to fit together into one picture.
You shouldn't be scared of putting together a team made up of experts who are better than the coach in some aspects... So for me personally, it was important to have people in my environment who discuss things with me, who give me their opinions, but who are loyal to me and who are reliable.