Actually, all our sources of information from Mosul confirm that they have absolute control, especially with the sympathy shown by the people of Mosul.
Just to back up a little bit, there was always a tension between the Muslims of Mosul and the Christians, although it was something not floating on the surface, because of the Saddam regime, because of the transitional stages that Iraq faced during the last century. Yet with all the information provided, I can say that they have full control. Not only that; they have high technology. An eyewitness told me that when Abu Bakr al-Baghdadi delivered his speech at the Mosul mosque on Friday, he was very calm. It was very secured to the extent that even cellphones in the area were cut off. Who owns this technology? You can't buy this technology at the corner store.
As another example, when the Americans started their air strikes, there was a huge establishment that during the Saddam regime was a military-industry establishment. ISIL took that establishment as a headquarters for themselves in Mosul, and from there they were running it. The night before this building was bombed and destroyed completely, ISIL evacuated, so....