In term of acting, "Warlord" was pretty interesting to gauge Jennifer Lien. Until this episode from s3, Lien's Kes was limited to play a generous, kind and compassionate Ocampa who became quickly the favorite of the Doctor and the crew's favourite medical assistant and the actress was good at this and it was almost natural for her. But let's be honest, the role was quite passive
In "Warlord", the actress had for once, a more active part, in every meanings (more expressive, more physical, more emotional) and again, Lien did a fine job.
I'm pretty sure that if her character had been more developped and above all, earlier, it would have been clear to anyone that her presence was necessary, even under a hologram figure.
Anyway, even if I adopted Ryan's Seven quickly - much more I though -, I trully regretted Jennifer Lien's absence, whose the character was like "the good friend" that we hope to keep close and whose the presence keep you quiet.
I liked Jennifer Lien her and once her medical problems over, I hope she will come back on our screens.
For me, "Fury", was rather a Picardo's episode, for me.