You can get respect without yelling at people. What would be delegated is the guy that really get's in people's faces. It's not necessary for the HC to do that and I'm not certain it's necessary for anyone to do that. There are many ways to gain respect and be a leader.
Nope, you have to do the heavy lifting yourself as HC. I didn't say anything about yelling, you did. Several great coaches were not known as yelling guys. Bill Walsh and Tony Dungy come to mind.