A bankai in my opinion can never be mastered. Everyones bankai is continually getting stronger. Remember when Stark asked whos bankai was stronger and the captain said maybe in a hundred years his will equal mine since he is a prodigy. Even Yamammotos Bankai had 5 degrees to it with the whole...
You know I was actually thinking about what his bankai will evolve into. Currently he can control the blades but in his true bankai form we see thousands of swords. Maybe as his bankai grows and he masters it he will be able to fight with 1000 swords opposed to the petal blades. That would be...
