Think it really depends on the context really. Multiversal groups makes more sense but for more in universe groups it doesn’t . In my personal opinion , I typically defer to not have duplicates cause it can lead to problems.
Such as , one of the writers being backlined for another , favoritism shown to one , clashes between the writers for who does what , it can convolute a storyline if there’s multiple of the same muse running around .
/ sai is genuinely the first Naruto character I ever wrote so he'll always hold a special place in my heart , I wish kishimoto did more with him .
