User blog comment:Zack Tan/Ainz's Possible Future Plans/@comment-121.7.125.105-20151020164911/@comment-27099834-20151020175143

The memory loss for Shalltear is really unique in the sense that the 3 lizardmen (Zaryusu & co) who got resurrected retained their recent memories. Zaryusu remembered the moment he fought with Cocytus and died. Maybe NPCs are unique in not retaining their most recent memories, or Ainz used a different resurrection method for the lizardmen & Shalltear. If it is the former, then Clementine getting resurrected would be dangerous for Momon's identity.