Like every other episode in the third season, this is also a really good one.

It's nice, to see the Junior Owsla being smarter then their adult counterpart

We have the death of Skree's mother. Generally, Woundwort seems to enjoy fighting and killing Elil. I also could imagine, this is some kind of revenge for him, because his mother got killed by Elil.
And of course we have Skree joining Watership Down. An interesting twist and important for the whole continuation of the story (Skree saves Campion, later Blackberry, Spartina and Campion again). That wouldn't be possible with Kehaar.
So this episode is an really important part of the story.