In the runup to Iraq’s Oct. 10 parliamentary elections, the northern city of Mosul has emerged as a flashpoint in the contest between three key Sunni blocs: the Takaddum Front, led by current Parliament Speaker Muhammad Al-Halbusi; Khamis Al-Khanjar’s Azm Front, which is linked to Turkey and Qatar; and the Turkey-backed National Salvation and Development Front, led by former speaker Osama Al-Nujaifi....