Actually ever since Maulana Inqilab and Khan sahib were "utilized" by their so called "umpire", there were few issues which needed to be settled with Nawaz. Coming with a delusion that Military has been restricted to its key role-even though we saw gen kayani doing the same FM stuff with US,Afghanistan,China and KSA, despite PPP having formal FM in service- he started some of the key phaddas with military machine.
1-He wanted the department of Military Lands back into civilian custody. It used to be headed by a civilian until Musharraf appointed a military person as a occupational bribe post military coup. By this, Military assumed complete command of lands in use by military. This was the first clash.
2-The supportive stance for Hamid Mir's after the assassination attempt.
3-Trying to restart the negotiations with India which the military has never supported-except in the reign of ex-gen Musharraf- However, Modi in India, coming in power on Anti-Pakistan agenda, couldn't also find it easier to backtrack on his entire political campaign. However, this expanded the vacuum.
4- Initiating the trial proceedings of Musharraf. This created a real tension between civilians and the army. Army has one rule, it protects the depends and the ex-COAS no matter how bad they have done. One of COAS impeached meant the opening of doors for not only future ones but also the past ones if necessary. This door was to be closed at all costs come what may. However, the result was an unprecedented rise in the tension between NS and the Army.
5-The mishandling of Model Town tragedy proved to be a blessings in disguise for both planners and the pawns. The day COAS met NS and was given a commitment for "shared space" on Foreign Policy and Internal/External Security, Ijaz ul Haq-The son of Ex-CoAS-, out of no where approached the PTI+PAT leadership and "made them" agree to negotiate.
Maulana was paid from both sides and left after taking his "salary". Khan sahib was left unpaid neither in power, nor in money. However, as soon as the "blessings" went away so did the impact. He made hue and cry but was shrugged off via APS opening ceremony event.
6-Altaf Bhai was used to great effect through Musharraf Channel but it seems like he also kind of met a similar fate as Khan sahib, empty handed at the end of the day with Police/Rangers rampaging through the network.
However, there were some principals agreed upon for power sharing resulting in COAS now managing the key 3 i.e. US,China and Afghanistan while India is being given the cold shoulder -for which Modi and his team is also responsible by sabotaging the FS meeting-
On internal front we already know the establishment of military courts and so forth where army has assumed the internal security. My only concern is that once starting the all out war, army will have to own it till the very end.