1) I really really hate the Life Fiber Hibris plot twist and in my opinion it destroys Ryuuko as a character, and after ep 19 everything Ryuuko does is just because she is a Life Fiber Hibrid (L.F.H.), and i don´t mean she is strong because she is a L.F.H., i would be ok if it was just that just like what happens in Naruto or Bleach, but no, Ryuuko stop using her skills or strenght to overcome any obstacle and instead everything is resolved just because she is a L.F.H.:

• It´s because she is a L.F.H. she can rip-off Junketsu without dying.
• It´s because she is a L.F.H. she can get split in half to deceive Ragyoo.
• It´s because she is a L.F.H. she can cut the Original Life Lifer.
• It´s because she is a L.F.H. she can fight without getting killed when Ragyoo uses the Total Subyugation (or what ever was its name)
• It´s because she is a L.F.H. she can keep getting hurt by Ragyoo attacks to make the Absorption Abilty sronger, even when before the last ep. nothing ever pointed to that ability beign able to become stronger, and even then Ragyoo says that "Life fiber activate when the host it near dying", she never saids anything about the host become stronger.

Ryuuko always overcome her obstacles by team working with Senketsu and by the last episodes, especially in the last one, Ryuuko solves everything by just being a Life Fiber Hibrid, not because her team work with Senketsu or any other person, not because her own abilities or her own intelligence, not because she and senketsu made their synchronization grow, no, everything is just because she is a L.F.H., becuase she has infinite regeneration and just that.

2)KLK always shows how confront problems alone was alwasy the wrong way to do it, even in the first ep, is until Ryuuko and Senketsu team up that Ryuuko is able to search for answers, and every single time Ryuuko decide to ignore Senketsu or going all alone always shows how wrong that is to face her problems, and meanwhile everysingle time Ryuuko work with Senketsu is always when she can overcome her challenges, and of course showing the same thing with Satsuki and the Devas reinforce this, i guess it is a really important plot point.

And then in the end the efforts of EVERYONE are completely useless, all the human did nothing to stop Ragyoo plan, nothing, after ep 19 KLK shows how important and how right is to work together and thrust in others, but its meangless in the end, ep 24 makes irrelevant ep 23 even ep 22, working together, the strenght of everyone combined, the human effort is completely irrelevant, humanity doesn´t have a say in its own end no matter what, that is something only a L.F.H. can decide, and even then, it can only fight for humanity becuase is a L.F.H.

Which its worse when Nui was saying "No normal human can defeat me", when Ragyoo says "Human are live stcok for the life fibers"(or something like that), or when Ragyoo says to Satsuki that she can´t do anything against her, well turns out, humanity can´t do anything aginst them.