Why no simultaneous fights?

[Infant]

With Naruto and Sasuke fighting the aliens, Kara members can attack Konoha and other villages

This would offer a great chance to showcase what other characters can do in a believable setting since they should have no business fighting aliens.

It also makes sense from an in-verse perspective. Why shouldn't Kara attack when the world is without two of its strongest defenders?

So why do the authors not have simultaneous fights?

 

[Yahcob13]

Code is the only Kara member left now. Even before that they managed to kidnap Naruto so they didn't need a sophisticated attack strategy.