One of the things about AV that hasn't been mentioned is the 25% chance to remove 20% turn meter. This could potentially could be used to strong effect with a careful build.
With AV as lead it would make a maxed NS teams speed this
Nightsister Acolyte 167
Old Daka 154
Nightsister Initiate 140
Talia 137
Asajj Ventress 114 - assuming she gets benefit of her own buff. ( I haven't tested it)
For reference
https://gyazo.com/196836cec0f39e119ac79ee2fdc13fc9Both of the Nightsisters no names basic and special damage is middle of the road and nothing to write home about. At least the Initiate is somewhat tanky with 18k health when maxed. Talia and Old Daka basic damage is really low as well. AV would be your biggest hitter but then then she isnt exactly a knock out punch. One of her strengths that Ive found is when she gets the KO on the first person you decide to kill b/c she basically can AOE everyturn after untill she is killed or doesn't kill anyone. If you focus on letting her get kill shots then its not a problem. The biggest problem I had with my NS team was I didn't have enough of a knock punch to get past glass cannon/Poe teams. Sadly my server is littered with these teams in the top 200. :/ It might work for you though!
Oh also, I had heard AV lead buff was bugged at some point and not working. I'm unsure if its been fixed yet. I haven't followed up since I switched out of using that team.