Tashigi getting a black blade is like chopper suddenly getting ACoC it would feel so unearned
Her sense of justice involves taking blades from criminals for the true purpose they should serve. She has an uncorrupt view of using swords.
She's going to find a retribution blade or something.
Her entire purpose as a character involves taking swords.... it would be weird if she didn't actually do it at some point.
And at this point... her stealing a crappy blade can go unmentioned. She has probably collected a hundred blades that she just doesn't talk about.
Tashigi simping here all day
It would be similar to Koby suddenly making mountain size feats... we knew he was training... but not LIKE THAT. That was a surprise.
Tashigi may have a surprise for us. Maybe?
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I figure... if the narrative is going to be GOOD...
Then it requires two things to happen
1. Tashigi must acquire a black sword from a criminal by chance.
2. Tashigi must face off against Zoro toward the end of the series to take his black blade after she has already taken one (or even more than one!) from criminals. Tashigi will lose this fight.
For Tashigi's dream to make sense narratively, she needs to be boasting that she is a threat to black sword users by the end of the series.
My hope is that actually comes true somehow.