I don't know but right now the BB pirates don't give me the feeling of a really powerful crew,put aside Teach and Shiryu,the rest even those who were at level6 although the hype they got that they were very strong and brutal and done things that their existence erased from the world,don't seem like opponents who would give for example a good match against someone like mihawk or dofla etc etc.
They are probably very strong for sure,and even back at Banaro Island when Burgess and Van Auger failed to hit/damage Ace i wasn't really dissapointed because i knew that even the MT couldn't do anything against any Logia.Now after the TS put aside luffy i believe that atleast zoro would probably has control over CoA and i believe the same for the most of the BB pirates.
Don't get me wrong i don't say they are weak,just that they don't give me the feeling that they are super strong,and as i said above put aside Teach&Shiryu, the others don't seem like guys who can win a fight against someone REALLY strong.At best handle their own against the likes of mihawk,Marco,croc etc etc but win against them?I really doubt.Now Oda after the TS may come up with a chapter or two showing them do something or a glimpse of their power,i hope at least because they didn't have a chance to shine,even if they gang up against WB and killed him for me wasn't something special because he was already half dead with his half head missing.The only thing that "hyped" them a little is Teach mocking Bonney that although she was a rookie she wasn't enough strong to join them,but anyway i didn't have the impression that she was a strong woman even back at SB and her power wasn't something really strong/special,put aside Akainu's words about her relationship with the WG i just believe that she isn't a strong fighter