I assumed the worst - didn't expect Drusilla to be helping.
And Giles did indeed some thinking, they didn't have a way to keep Ethan away from them, not causing trouble.
The question is - Wilda. If she can't rebuild her power they will be save. Not sure if she would try something without Ethan though.
Ah Spike explained, so they should be save now. :)

Author's Response: Yea Wilda worries me too but I guess as an empty shell she can't do much. I think she was basically working for Ethan instead of for her own gain. Not sure what she would get out of having a slayer baby anyway other than being with Ethan.