Speculations on top of speculations. If you really understood the situation as I understand it, OP article gives you incomplete information. There are a few pieces missing. And at least one piece of the puzzle needs to be rotated 180 degrees before fitting it.
The unnamed minister is Ch. Nisar, and before one takes his word, one needs to put his views in perspective.
General Raheel Sharif is not in this or any coup business. He is the odd one. The lucky mistake that has worked in favor of NS so far. If you look at everything, a coup was a foregone conclusion. It has not happened. I went out on a limb (just one piece of information), to declare that there would be no coup. So far so good.
This time it was not about making PM NS to agree to this or that. It was about getting rid of him. He is lucky and he shall stay lucky in my opinion. But he has no margin of error now. He either must control his ministers, or reshuffle the cabinet and side-line Kh. Asif and Kh. Saad Rafique.