Hello! Happy Thanksgiving everyone!

One of my favorite moments in the whole series is Guy's fight against sage Madara when he opens the final gate of death. We get to see the most dope taijutsu like Evening Elephant (Seikzo) and Night Guy but I have a question.

I know there isn't really a proper answer to this (at least not released or given to us in the anime or manga) but how did Guy train moves like Seikzo and Night Guy if he could not open the final gate without death being assured? Would he not need that intense level of chakra to perform moves as so?

I always thought that maybe they are inherent moves that each Eight Gates user has and can simply call upon when the time is right but nonetheless I still think it's an interesting thing to discuss.

Thoughts?