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Could someone reminde me why he wanted Robin excluded from the targets.

The whole calalyst for the Water 7 sagais that he wanted her killed, hence he reported her whereabouts to CP9

Why did he change his mind?

If he suddendly wanted her alive, Would that not also imply that even if Spandam succeeded in getting her thought the gates of Justice, Aokiji would have taken some kind of initiative and broken her out of custody  (again?)