That would also be proof of a sub par commander. You get a new member who is top of her class, AND a close friend of the transforming titan and you don't ask about or read reports (there are reports, it is military after all) about her skills and achievements?

Mikasa has saved (when she forced that asshole merchant into the gate etc.) more people and killed more titans in her 2 weeks than most of the scouting legion in years of service.