At least regarding, The Shadow of Kyoshi, I would've given the Flying Opera Company an actual role in the story. It was super disappointing that Wong and Kirima only came in at the end just to instantly get beaten in the final battle.

The Shadow of Kyoshi could had used them to portray how Kyoshi now being a profession criminal would affect image as an Avatar. Also how Kyoshi was manipulated with working with Zoryu that broke her daofei vows would've a stronger impact if Kirima and Wong was there to call it out.

This could be a problem with the medium(books) but the kyoshi novels almost feel like a whole different franchise.

I noticed that Roku's novels felt a little more "avatary" than kyoshi but that might also be a thing with the authors.