Board Thread:General Discussion/@comment-1970092-20160521174544/@comment-27565137-20160521233246

Yeah. I know. Some people got into their heads that the flames weren't actually flames but reishi. Besides the simple fact that the release command is "Burn! Engetsu!" just like Ryūjin Jakka release command is "Reduce all creation to ash!".

So yeah. Engetsu is definitely a fire type zanpakutou. Isshin even used his own blood like it was gasoline. Some people simply found it weird like when fighting Aizen, Isshin used Getsuga Tenshou without using his shikai. Which was shown Isshin doing it again when he entered Masaki's mind and slashed at the hollow mask that was gonna strike her with another Getsuga Tenshou, again not using Engetsu.

Which in a way only serves to prove that maybe Getsuga Tenshou is a generic technique inside the Shiba clan. For all we know Kaien was also able to use GT. And if Ganju and Kukkaku also wielded a zanpakutou, maybe they too could use it.

I guess now all we need is to wait to see Isshin in action to get all the facts right.