Chibiusa finally learns the identities of the Sailor Senshi though she should've known all along. For example - 1) she knows them in the future and should know their civilian identities as well. She is named after her mom, Usagi, and even knew to seek out Usagi for the silver crystal. 2) The Sailor Senshi come in a group of five with the help of one man just like the five girls she hangs around with who occasionally team with Mamoru. Furthermore, Luna and Artemis are often with the Senshi while Chibiusa is in their presence. 3) After Koan and Berthier are purified by Sailor Moon they begin hanging around with the girls and Chibiusa. 4) Lastly, Chibiusa is often saved by them when the girls are the only ones who know her whereabouts such as in the vacation episode.