Board Thread:General Discussion/@comment-26511634-20150619122040

Isshin Kurosaki was able to unleash a huge Getsuga Tenshou when fighting Aizen. How is this possible? Are the Zanpakutō powers related with their Family? We are also told that he knows the Final Getsuga Tenshou as he says his Zanpakutō did not easily teach him the technique. He says that in the Dangai Precipice World.

Any theories or does anyone know how he has the same technique as Ichigo? 