Christine wants to rejoin the band according to The Guardian

[aleuzzi]

Honestly, I don't think Lindsey is trying to block her return. He just wants her to be a full partner in the process. While I don't think that's necessary I do see why he feels it is. In truth, I think he'd be elated to work with her again. A lot of what seems like resistance to her presence is related to her two-off performances in London...a very specific case.