Mechanically, I'm happy to add +X (Acolytes of Khaine) to Natasha's party. Very happy. I consider that a certainty and it's good to further bolster our numbers. And you're right, they might. But they might not, and it costs Kerillian as a party member to try it. I'd rather not gamble on it.
This is not true, on several levels. A druchii looks like any other elf, however these acolytes are clearly khainists, but they're also clearly very young. They are not an authority, in fact they may even provide some conceptual protection to have a couple druchii with us.
It might be a point of conversation ore ven contention, but I'm not sure you're registering how incredibly effective Sadrina is at recruiting Asur, Roland and Jacqueline are at recruiting Bretonnians. A handful of druchii children do not outweigh their impact, nor the impact of Oksana and the pegasus and the mighty priestess of the widow leading them all.
By the way, we already had the vote for focusing or not focusing on recruiting more fighters! I voted for it but the thread voted against. We are on the warpath, and the loose additions we might pick up along the way are not the priority. We do not preclude them from joining if we encounter them, but it isn't going to be Natasha's focus anyway.