Lineup #1 with Siobhan.
Lineup #2 with Heidi. Mutya in the middle.
I'm not surprised, the rumours that the girls don't get along have been around for a long time but I agree, Mutya might just want to be with her daughter now. Keisha/Mutya/Heidi did manage to record three great albums. It'll feel odd without Mutya, though.
I haven't heard Siobhan's solo stuff but I think the sales weren't great.