Looks like Kago is leaving Girls Beat after their February 29th show:
http://ameblo.jp/kagoai1988/entry-12129331969.htmlCombined with her blog move to Ameblo, it looks like she's ready to start a new chapter in her life. Both Girls Beat and her Diamondblog presence seem to be products of her ex-husband's doing, and with him out of the picture the changes make a lot of sense.
Admittedly I never paid much attention to Girls Beat, but I do hope Ryona and the new girl continue to pursue their dreams, whether it's continuing the group or moving on themselves.
As for Aibon, I gotta say this is the most excited I've been for her in a while. New jazz album? Better gigs? A stable life for her and her daughter? Whatever the future has in store, things are looking up.