In my opinion, Manager does not need to have more knowledge than their members. I met a few managers before, they do not know more than their members, they can be the manager of the team may be because they have more work experience. Jack Ma, he is the founder of ALibaba Group. He said he knows nothing about IT, but he is one of the famous manager in IT area. Knowledge is not the most important requirement for members, there is must be something else. Like I said, it is may be work experience, or it s may be good social skills.