User blog comment:Miskos3/Fairy Tail 539: World Destruction, Review/@comment-24053170-20170611084444/@comment-7418318-20170612174718

Or he might recognize her for whom she is, since he did know her as a (newly revived) child. Not to mention that Anna is older than Lucy and with them being 20+ generations apart they probably have different scents too.

But that makes me wonder... was he immediately so friendly with Lucy just because she gave him food, or was it also in part because she reminded him of Anna?