A recent study suggests that a mentor figure, like a coach, can provide significant benefits to a leader.
It says that out fo 45 CEOs surveyedfollowing making a formal mentoring arrangement "71% said they were certain that company performance had improved as a result. Strong majorities reported that they were making better decisions (69%) and more capably fulfilling stakeholder expectations (76%). More than anything else, these CEOs credited mentors with helping them avoid costly mistakes and become proficient in their roles faster (84%)."
It goes on to say that "On the basis of what we heard, we are convinced that more CEOs should connect with mentors rather than assume that theirs is a burden to be shouldered alone."
You can read the study for yourself at https://hbr.org/2015/04/ceos-need-mentors-too