Many fear that Mullah Nazir's death may upset this balance, especially if the fourth faction in the region, the Tehreek-e-Taliban Pakistan group (TTP), is able to force an advantage in Wana region.
It strikes me as a bit strange in that until recently the concern about Pakistan from the Pentagon was the exact opposite, in that too much focus has gone to South Waziristan, too much focus has been on TTP, and none of it is the enemies that you have focused -- which is on the Haqqani network and the Quetta Shura Taliban.