Don't take this as gospel, but my recollection and understanding from that time was that Amelle was being pushed as the focus, and then in the assumption that during the window that Amelle was leaving, Keisha formally offered the suggestion to Crown that Mutya could return. Mutya was shockingly willing, however Crown was reticent, and Heidi was adamantly against it. Keisha was very liberal with her online presence during the time, and posted and messaged many things that perhaps went against media training (like listing Sweet 7 low on her ordered list of favorite Sugababes records as she was promoting it). Keisha seemed convinced that Amelle's departure really could allow Mutya to return despite Heidi's protest, and messaged a few fans that it was going to happen.