Above all this, the only other person who would fit well in this role does not wish to have it (Bryn) And gives it to you personally. Granted position of leader after you help the guild out of a troubled time, become a nightingale - bring down the previous corrupt leader and bring back an old face all the while making the guild some serious gold and picking them up off their feet. This makes sense despite the 'small' quest line. You are in one of the most important positions already so it just makes sense that someone who plays such a crucial role in this group is given the title of leader.
The previous leader has died and you have been crowned the 'listener' a position that was granted to you by the 'nightmother' who is already the most powerful person in this group. Like I can deal with becoming the leader of the Dark Brotherhood after a short amount of quests I can deal with becoming the leader of the Thieves guild after a short amount of quests becuase both of these have REASONS: Anyone else agree that the college of Winterhold is just a complete failure?