Didn't say One Piece had a Vegeta or Sasuke, just that Zoro is the closest you'll get. Law has no membership in the Straw Hats the way Sasuke had with Team 7/Rookie 9 or Vegeta had with the Z Fighters.
Law was a long time ally of the straw hats fighting for his own reasons just like Vegeta was of the Z fighters during the Android saga. Vegeta was never really one of the Z fighters until Super. He was always more of an ally
 
Law was a long time ally of the straw hats fighting for his own reasons just like Vegeta was of the Z fighters during the Android saga. Vegeta was never really one of the Z fighters until Super. He was always more of an ally
Difference is Vegeta was grouped with the Z Fighters (which is really just a band of allies who fight alongside Goku). Law has no part in the Straw Hats. As far as we're concerned, he's just an important side character.
 
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