I think some of the members resented the fact that Kiesha was the most "professional" and dedicated. I think Subgababes have only lasted as long as they did, because Keisha kept people in line and stopped the others from slacking....sure she may have come across as being bossy and controlling, but she had by far the most work ethic. She kept things going, and treated Sugababes like a buisness, not a showbiz party..
Amelle just comes across as being workshy. Heidi doesn't seem the sort to take charge, and just seems kind of clueless. And while Jade seems ambitious and professional with a work ethic to match Keisha, she's the newbie....so she can't exactly turn up and start trying to tell Amelle and Heidi to get their sh/t together. The other two just got rid of one professional overlord, and won't tolerate another