If you're talking about rooftop, Kakashi had to stop that fight or else Sasuke might have died because his chidori wasn't even with rasengan until after he took he pill and went in that box. Kakashi only asked if Sasuke was trying to kill Naruto, not that he would have
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. Sasuke knew he would have lost after seeing the back of the tank
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and
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.
In VoTE fight, Sasuke was fighting to Kill Naruto
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where a Naruto wasn't fighting to kill, he even said he'll bring him back even if It means breaking every bone in his body
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. Kurama heals any of Naruto's wounds
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and
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. Naruto, not wanting to kill Sasuke, went for his headband
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but if Naruto had the intent to kill then he could have went for Sasuke's chest like Sasuke went for Naruto's but the differences is that Naruto would have been healed So Sasuke only won due to Naruto letting him.
When Naruto first met Sasuke in Shippuden, he was really weakened after going 4 tails
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,
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, and
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, these all show Naruto stumbling, falling over due to being weakened. Narut could have went 4 tails and beat Sasuke since he was going to kill Orochimaru (Oro said so himself) and Sasuke needed to surprise attack an even weaker Oro to beat him but Naruto didn't want to use Kurama and was about to suppress him but Sasuke came and did it for him.
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Sasuke won because Naruto let him, that simple. If he had killing intent, Kakashi didn't interfere or if he used Kurama power then Sasuke wouldn't have lived after any of those fights. Can't really argue against that, it was plot for those to keep the story going