Amy. She was the only one that they ever seemed on frienldy terms with them in the first place.
Harmony: Would have hated being in with them, or would have eventually betrayed them because she had no reason to join them. Cordy had a guy. Harmony was too much of a sheep. A definate follower. The "I'll do what everyone else is doing, so I can say I did it first." NO!
Johnathon: What? No! He would have been worse off than Xander! He would have been the quiet guy that always got kidnapped!
Larry: Well, I can't say a definate "no," but no.
And on Lily: If they make another spin-off: MAKE HER A MAIN CHARACTER! Or, hey, she could still be living in L.A.!... One of the things that Buffy told her at the end of "Anne" was that learning to take care of yourself takes practice. Well, she would have taken that to heart and would be better for it!