The real reason(s) Christine is returning.

[tomv]

I think all the reasons given are probably valid. The real question to me is why does this sort of thing not happen more with bands. Typically, when a band member leaves on their own accord, they never come back. The bass player from Queen left and has zero interest in returning. Bill Wyman from the Rolling Stones, same thing. Same for the drummer from REM (Of course the whole band is retired now). There are other examples too I could come up with if I thought about it.

This is different but I like it! On with the show!