User blog comment:RennaGraceCarter/Yukino's Sister/@comment-5444132-20130418220436/@comment-7418318-20130418225642

I don't see how Angel would know more about celestial spirit magic than Lucy and Yukino at this point. While she might have been more experienced (before she threw it away in favour of angel magic) she never had such a deep bond with her spirits as the two of them.