The US special envoy to Afghanistan and Pakistan has said there were signs of disarray within the Taliban in Pakistan following the apparent death of the group's leader in a missile strike. Washington says there is a "90 percent certainty" that the Taliban leader, Baitullah Mehsud, was killed in a strike by a pilotless CIA drone earlier this month in South Waziristan. Mehsud's aides have disputed the claim and say he is alive. "The end of Baitullah Mehsud, as we all know, is a very big deal," U.S. envoy Richard Holbrooke said Wednesday, citing reports of "disarray among his people, of other factions maneuvering." At a panel organized by the Center for American Progress, a Washington think tank, Holbrooke said the "thrashing around" by the Taliban and its allies in Pakistan was "very good news for all of us." "There's going to be some major readjustment coming up. We don't know what it is," he said of the groups. Mehsud is, or was, the leader of Tehrik-e-Taliban Pakistan, or Taliban Movement of Pakistan, an alliance of around 13 militant groups. The counterterrorism official said it was unclear whether the Taliban would "unite under one banner again."