So, Karin was able to damage the Buddha Statue with her chakra chains...
She would have been able to defeat Killer B on their first meeting with her chakra chains.
Kushina's was stronger?
The use of chakra chain jutsu?
Surely the chains would have been able to stun and restrict Killer B from moving?
A very powerful ninjutsu, Team Taka would have easily defeated Killer B if Karin would have just used chakra chains.
[but she didn't at the time because of plot no jutsu]