4 middles seem a lot. And the youngster, Chiaka, proved herself over Adams. I would go with 3 setters and 3 MB. 4 outside and 2 liiberos.
Totally disagree with you. Having 3 MBs is suicidal for a long tournament such as WCh. Moreover, it is clear that Lloyd will be the starting setter so why to have 2 backup setter?