Aleader who is passive and appears to be uninvolved in a group would be termed a(n) leader.

laissez-faire

Explanation:

Laissez-faire is a termed in french and is coined to make reference to someone or some authority that lets people be and do, in that case a laissez-faire leader would be someone that trusts the members of his or her team and lets them work and think as they want and doesn´t get too involved with what they do to give them liberty and freedom.

from the word list given, the most suitable words that relate to the reason information were written would be:  

objectivity: lack of bias, judgment, or prejudice

accuracy: free of mistakes, to be correct

authority: the ability to tell people what to do or believe in

content: to be satisfied  

it can be said that the author made the article to present objectivity, to provide accurate information, to be the authority in the subject that he or she writes, and to be satisfied of the information quality given out.