Board Thread:Naruto Discussions/@comment-36528625-20180810001142/@comment-5407586-20180824182322

KyfieLita68 wrote: I believe it was stated that it was Itachi. Kabuto said Itachi was his finest reanimation, not second strongest or anything. Only after Nagato's sealing did Kabuto have Mū summon Madara, which hints at Pain being the second strongest reanimation.