ISLAMABAD — Pakistan’s destruction of a militant madrasa near the Afghan border means Ayman al-Zawahri has one less place to go, but analysts say any idea the net is closing on al Qaeda’s Number Two would be wishful thinking.“Zawahri’s name pops up almost after every such attack. But there has been no sighting of the man in Bajaur at least recently. There is no evidence. It’s all speculation,” said newspaper editor Rahimullah Yusufzai, an expert on Afghan affairs. In the deadliest strike mounted by the Pakistan Army against al Qaeda-friendly tribal militants, helicopters fired missiles at a religious school run by a pro-Taliban cleric near Khar.