I thought it was something more like you can't really be stronger if you do things alone. It really depends how Takaharu uses the knowledge in the end. It's not a unique situation anyway. For example, if you want to view it that way, Dekaranger was all about teamwork for most of the series, only for the team to be used as a stepping stone by Ban to become a supercop.
I don't mind Takaharu saving Kasumi once, since well, Kasumi saved him once, too. Takaharu has to be useful somehow (since he's basically all flash, but pretty much no substance for most of the 4 episodes). But I kinda wish Kasumi shines in a less subtle way this time around.
On ToQger, it's first few episodes (and most of the series actually) never caught my attention like Ninnin does. None of the characters at this point of ToQ were really distinctive.