Vic has talked about, in the context of transfers, the yin and yang of the desire to improve the team at a need position versus the risk of impairing a younger players' development. This same logic extends to super seniors.
If any of the seniors served as "mentor and role player" only, it would not be an issue. But knowing Vic's emphasis on experienced defense, I kinda doubt that would be the outcome with Jo, Audrey, or Lauren.
In calculus, it's called a local maximum, i.e. the first derivative is equal to zero. In player development, sometimes you have to accept lesser performance with a new player in order to achieve greater performance after the new player gains experience.