Ok so Naruto gets captured and brought to another dimension. Only Sasuke can travel between dimensions, Naruto owes him his life, without Sasuke's rinnegan Naruto would be doomed.
What would have happened of Naruto decided to save only his family and leave everyone else in the village to die? I guess Sasuke owes Naruto his life if it wasn't for him he'd be dead.
Better question would be world without Sasuke.
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