The New volume was never really a BOP book. BOP was based on the friendship between Babs and Dinah Lance and it was rooted in heavy continuity. DC thought that they could just use the BOP name to push any Tom, Dick and Harry.
There was ultimately never any stability in the original New 52 line up. The original writer himself brought in Babs and got rid of both Ivy and Katana with in 14 months. Then Marx comes in and gets rid of Starling in favor of Strix. It was a mess from day one.