That's an ability that Ichigo learned from his hollow right? If his pops can do one, does that mean that his pops has a hollow?
@sickVisionz: Wrong, Ichigo learned the attack from Zangetsu during his training with Kisuke. It wasen't until his fight with Byakuya that it changed from blue to red and black we are so used too. Simply because Hollow Ichigo took over and was the first person to use Kuroi Getsuga. His hollow side has shown to be able to use the exact same abilities as Ichigo. Their is nothing indicating that Isshin also has hollow powers, and the reason he can also use getsugaa tensho is a complete mystery