User blog comment:Godisme/Deicide 7/@comment-1296831-20100527180048

"According to SS law will Isshin and Ichigo need to fight to the death?"

Most certainly not, Isshin and Ichigo are in no way accountable to SS laws. Ichigo's allegiance depends on the situation, it's to whatever is most important to him at that time. And Isshin is basically a renegade Shinigami.

Besides, they kinda have more important things to worry about ATM. Last I checked Old Yama was outta commission.