al zawahiri, analysts say he lacks bin laden's charisma. >> he's viewed as a polarizing figure, someone not easy to deal with, not a good manager. >> al awalaki is seen to have commanded the airline plot. his achilles' heel. >> he's not a fighter. he's a cleric. he's a speaker. and not a fighter. and al qaeda over the years have wanted to be led by a fighter. >> reporter: credentials bin laden had from his years battling the soviets in afghanistan. but other dangerous figures could surface including saif al adal who is believed to have played a key role in the african embassy bomb also. al libi who rose to prominence for escaping from bagram air base. and a well connected bin laden