toddler spectacle of lights for a toddler character fanbase
idk, seems kinda staple thing for Zoro fights. Toei knows that Zorofans are attracted to bright lights. I think Toei has enough of data that shows them which fanbases react to bright, aura colors.
There is a reason why underage fan fav characters like Zoro, Kaido and Luffy have colors flashing most of the time in their fights
and why characters with a more mature fanbase like Admirals, Sanji, Law don't have auras/colors.
1 needs constant stimulation or they get bored and think attacks are weak
others look at the story, choreography, fluidity