Kawaki makes his appearance in Boruto manga at a specific point, but I can't recall exactly. You might want to check the official manga sources for the precise chapter.
It depends on the context. If it's a battle of pure physical strength and chakra, Naruto might have the edge as he has years of experience and has faced more powerful foes. But Boruto has some unique abilities like his Jougan. So if the fight involves using new - age ninja techniques, Boruto could surprise Naruto.
In many fanfictions, they are often portrayed as equally powerful in different ways. McGonagall's strength lies in her traditional magical skills and her leadership, while Snape's strength is more in his unique knowledge and his ability to adapt to difficult situations. So it's not always clear - cut who is stronger.
The elephant gun and the Barrett were two different types of weapons, each with their own characteristics and uses. The Elephant-hunting Gun had high lethality at close range and could kill the enemy's upper body in one shot, but its accuracy and stability might have some problems. The Barrett was an anti-material sniper rifle that was specially used to attack light armored targets and equipment with high accuracy and lethality. However, there was no clear information on which one was stronger. Therefore, it was impossible to determine which was stronger, the Elephant Gun or the Barrett.
The elephant gun and the Barrett were two different types of firearms, each with their own characteristics and uses. The Elephant-hunting Gun had great power at close range, but its accuracy was poor. It needed to be matched with a dead-eye lock to hit the target better. The Barrett was a large-caliber sniper rifle that was specially used for anti-equipment and long-distance shooting. It had high accuracy and lethality. Therefore, it was impossible to simply compare which one was stronger because their designs and uses were different.
It's really hard to say. Naruto has the power of the Nine - Tails and years of combat experience. But Boruto is young and full of surprises. He has his own unique skills. I think it could be a tie. They both have strong wills and would not want to seriously harm each other.
Well, when it comes to combat abilities in Naruto fanfiction, Sakura has some definite advantages. She's been trained rigorously by Tsunade. Her punches can cause massive damage and she can heal herself and others, which is a huge plus in combat. Hinata, though, with her Byakugan, can detect enemy movements precisely and her gentle fist attacks are no joke either. But Sakura's combination of strength and medical skills makes her a tough opponent. She can hold her own against strong enemies and also support her team in a fight, which gives her a bit more of an upper hand compared to Hinata in terms of combat abilities in fanfiction.
It could also be related to a prophecy or a pre - determined fate in the fanfic's plot. There might be some kind of dark prophecy that says Kawaki has to kill Naruto to prevent a greater evil. Or perhaps Kawaki is being controlled by an external force that has a vendetta against Naruto and uses Kawaki as a tool to carry out the murder.