XD Yeah, I think it was just earlier Momusus, with the stress of first starting out and all that. The current line-up ... well, I can't imagine Aika going home and screaming "TAKAHASHIIII" into her pillow as Mari did about Yuki
They might not get along 100% but I think the girls are pretty close now and don't consider each other as rivals.
Ai was so blunt about Eri xD But it was also interesting that she considered Sayu to be the genius of the group :3