The clash between Konan and Obito in Naruto marks a pivotal moment that sets the stage for the Fourth Great Ninja War. When Obito obtained Nagato's Rinnegan after defeating Konan, a chain of events took place that led to war.
In Chapter 508, Konan confronts Obito in Amegakure to protect Nagato's Rinnegan. She launched a fierce attack with her Paper Ninjutsu technique, even causing a devastating attack of 600 billion paper bombs.
Despite her efforts, Obito survived by hiring Izanagi, escaped the explosion, and eventually overpowered Konan to learn of Nagato's whereabouts.
What would happen if Konan defeated Obito?
If Konan had won that battle, the trajectory of the series could have been very different.
With Obito defeated, Nagato's Rinnegan would be out of enemy hands, potentially preventing the Fourth Great Ninja War altogether. Obito's pivotal role in the conflict, as the leader of the villain faction, will be neutralized.
Furthermore, Obito's death may have prevented important steps leading to war. For example, Kabuto's plan to revive Madara and eventually Kaguya through Obito's actions would be interrupted.
Madara's resurrection, depending on Obito's Rinne-Rebirth, will not happen, thus changing the course of the series.
In this alternative scenario, the focus of the story may have changed significantly. Sasuke Sasuke, led by Taka (formerly Hebi), could emerge as the main villain.
Without Obito, Kabuto's ambition to revive past shinobi, including Itachi, may have been delayed, affecting Sasuke's motivations and potentially leading him to attack Konoha.