Well, they might face a lot of moral dilemmas. If they see the future and try to change it, they could end up causing more harm than good. For instance, if they prevent one event, it could lead to a chain reaction that creates an even worse situation. Also, they may not be believed by the other ninja at first. People might think they are just spreading false information. But as the events start to unfold as they predicted, others might start to listen to them. And it could be really interesting to see how they deal with the pressure of having to change the future of the entire ninja world.
Perhaps they would discover secrets about the war that were previously unknown. Maybe there are hidden motives of some of the key players that they could expose. Naruto could use his talk - no - jutsu on the enemies based on the future knowledge he has. He might be able to convince some of them to change sides. Sasuke could also find a way to use his new - found knowledge to gain more power and use it for the good of the ninja world. Sakura could train other medical ninjas in advance, based on what she saw in the future about the types of injuries that would occur during the war.
Look to Chapter 4 for the clearest answer. It begins with Qiao regretted her words as soon as they left her mouth., keeps building through Whether Jiang Yan can be found or not was another matter., and lands on A little girl acting mysterious, learning fortune-telling, what is this....
Chapter 927, "Jiang Li: Deceased, Do Not Disturb", is the clearest early answer because it turns Deceased's situation into a concrete plot event.
Chapter 928, "Only Earned a Few Billion", is the clearest early answer because it turns Doomsday Beehive's situation into a concrete plot event. The chapter turns that into something concrete by moving from Zhao Lang has been away for a month.
Chapter 914, "A Married Daughter is Like Spilled Water!", is the clearest early answer because it turns Like Spilled Water's situation into a concrete plot event. Early on, Jiang Li let out a cold laugh.. By the end, This revelation got the fans even more excited..
Chapter 3 is the strongest chapter-level answer because it starts from Qiao was still annoyed at the attitude of this unknown girl when she heard... and follows through on Jiang Yan, forced into a marriage with someone he did not love, had....
If you want the clearest chapter reference, go to Chapter 38. Early on, Jiang Li had also observed the girl who had just entered.; later, the chapter leans on Before arriving, she had briefly reviewed the profiles of the other three....
Chapter 929, "Award Ceremony", is the clearest early answer because the buildup finally cashes out in a real clash. A useful checkpoint is the way the scene starts with The Golden Statue Award is considered the most prestigious award in...
The best chapter pointer here is Chapter 51, "The Great Lodging Competition". It opens with Oh, okay." After uttering two syllables indifferently, Jiang Li bent down... and closes on If I opened a bar here, wouldn't I become a savior?" Jiang Yan was....
The best chapter pointer here is Chapter 34, "Official Recording!". It opens with Seeing that the public sentiment wasn't quite right, Su Yinwan felt... and closes on Now that Lili is misunderstood, they start to kick us while we're down."....
A practical answer is Chapter 22, because it turns the idea into a concrete scene. The chapter opens with Hearing this, Su Yinwan looked at Shang Shaojing with a face full of..., adds pressure through Why are you yelling so loudly?, and ends on Jiang Li's righteousness temporarily shut Jiang Yan.