David B. Ottaway on Saudi succession:
Veteran Saudi watchers of the royal family believe that decision could come down to who lives longer -- King Abdullah, who has outlived two crown princes already, or the current heir, Salman. Rumors that the crown prince suffers from Alzheimer’s are untrue, but there is no doubt that Salman has been slowed down considerably by age -- he is “certainly no longer the Salman of yesterday,” in the words of one Saudi who recently saw him, a judgment in which U.,S. officials concur. But if Salman does outlive Abdullah to become king, the thinking is that he will favor Ahmed because they are full brothers from the same tightly-knit Sudairi clan.
Should Abdullah miraculously outlive the far younger Salman, he has put his half-brother Muqrin in line to move up the power chain to become the next crown prince. Saudis say Muqrin is clearly campaigning for the job through constant public appearances, designed to keep himself in the limelight. Miteb has also been keeping a high profile, but most Saudi watchers doubt the king is ready to upset the whole al-Saud family by naming him heir apparent -- a move that would constitute an unprecedented kingly power play.