Montasser el-Zayat (] ) or Muntasir al-Zayyat (Arabic: منتصر الزيات‎ ‎ "Muntaṣir az-Zayyāt ") (born 1956) is an Egyptian lawyer and author whose former clients, according to press reports, included Ayman al-Zawahiri, since 2011 the leader of al-Qaeda, the terrorist organization, and al-Gama'a al-Islamiyya. Using only the above description and what you know about the world, "al-Gama'a al-Islamiyya has been leader of al-Qaeda since 2011" is definitely correct, incorrect, or inconclusive? 