Thanks for sharing this timely resource. 
 Favorite take-aways: 1 - Lead by asking questions.
2 - Being a good leader in one group doesn't mean you'll be a good leader with another group.
3 - Create an atmosphere of competence. 
4 - Building connections and appreciation among members.
5 - Build the status of each person.
6 - Focus on success, not failure.  
Concerns, or things I'd want to know more about: 1 - A leader without a group is just some joker taking a walk. 
(How does this square with the idea of building others up?  And with the idea that being a good leader in one group doesn't mean you'll be a good leader with another group?  Might leaders be flexible and fulfill other roles, gaining expertise in new areas, between leadership roles?  Even leaders have leaders.  Rather than a joker taking a walk, possibly this is potential looking for an opportunity with the right "fit"?) 2 - Voting creates coalitions and opposition if not handled well. 
(Are coalitions and opposition necessarily bad or counter-productive?  Might they challenge a group to consider all facets and come up with the best idea?  Might they provide friendly internal competition which drives the development of  alternatives and a viable Plan B?) 3 - Consensus 
(Might this, in some cases, be the equivalent of signing a blank check?) One organization I'm familiar with noted that leaders are those who maintain the ability to stay in the conversation. I also read somewhere that "Cooler heads will prevail."