Petraeus and Pakistan's needs

Here is a long post at China Matters that discusses in some detail the situation in Pakistan after the Mumbai attack. One previously unknown fact jumped out as I read it:

Indeed, in an event that is either the sign of the ever-increasing militarization of U.S. foreign policy or a signal that international aid to Pakistan must conform to America’s security strategy—or both—none other than the head of the U.S. Central Command, General Petraeus, discussed Pakistan’s needs at the IMF annual meeting.

In my last post, I looked to the possibility of a military coup in Pakistan, it may be that I was wrong, and the coup has already occurred, but it was by the US military under the direction of Gen. Petraeus. Why bother having Kayani or whomever take over when Petraeus seems to have taken everything and everyone under his growing wing?