Sakumo Hatake known as the white fang of Konoha was one of the powerful ninja from Konoha who was feared thought the ninja world. He was a great ninja idolized by his son another genius ninja just like his father Kakashi Hatake aka the copy ninja.
It was when Sakumo and his team were on a mission, his team member’s life were in danger so he chose to save them abandoning the mission which lead to the failure of the mission which was actually an important mission for Konoha. The mission’s failure resulted in criticize of Sakumo by everyone in village even the team members who he had saved, due to which he was dishonored leading to his suicide.
This was also the reason for Kakashi to become absolute and live by the rules.
The point is even though he was dishonored and criticized he was the great ninja of the leaf, getting a buried respectfully.
During the 4th ninja war Kabuto who was the right hand man or underling of Orochimaru used the summoning which is the Kinjutsu(forbidden technique) which revives a person by binding the soul of the died one with a vessel which may be another person. At the beginning the summoner may choose to give free will to the incarnated person but he can also fully take-over the person.
Kuboto indeed revived many strong shinobies including died members of Akatsuki, Kage’s of different nation’s, the 7 sword ninjas of mist and many other strong ninjas including Konoha’s Asuma, Dan and other.
Since Kabuto found DNA’s of Asuma and Dan of Konoha he should definitely find Sakumo’s DNA leading to his revival, and if that had happen then the war would have been even more disadvantage to Great 5 nation, thanks to Minato 4th Hokage and Hirezen 3rd Hokage who where trapped in Ripper death Seal due to Kuruma the nine tail for Minato and Orochimaru for Hiruzen and Hashirama and Tobirama were also trapped in it as they were summoned by Orochimaru by 3rd Hokage.
Sakumo was a Kenjutsu user which is basically the usage of the sword, he used White light chakra sabre which is a sword produced white light streak of chakra when swung. Which was later used by Kakashi. He was so strong that everyone feared him.
Sakumo considered at the level of Sanin’s which signifies his gravity of presence. If he was so strong then Kuboto would have definitely benefited from him.
It can be assumed that he was ready for summoning but wasn’t summoned, or Kabuto got full of himself and believed that he didn’t need him for War.
It would be great to see him if he was revived (I’m not siding with enemies though) because his brilliance was never shown, we would have got to see him in action. An excellent plot of a Shinobi the White fang in action.
It even would have exciting it there was a encounter between Kakashi and Sakumo their epic battle and an emotional ending to it, as Kakashi wanted to know why he disbanded the rules to save others, like Sasuke and Itachi.
Conclusion is that we don’t know exactly about Sakumo not gettig revived but it would have been great to see White Fang.
Thanks for reading.