Involve the alliance in the war.
Re-write to where Neji uses an Arial rotation like the DAMN GENIUS HE WAS.
Following that, re-write Madara giving Nagato his eyes (ruined Nagato)
And then have a collaborated effort to defeat Obito.
End with Sasuke vs Naruto and a epilogue to see what happened
If I had to go with no changes.
1. Involve the alliance.
2. Obito uses a large blast to kill Tenten and other shinobi who have kept into the air.
3. Gai goes 8 gates to buy time. "I will not allow another one of my precious students to die. GATE OF DEATH OPEN!"
3. Despite buying time...Obito is unaffected. Some combination of Hiashi, Kiba, and Shino dying.
4. The above advances Hinata's eyes
5.Have Hashirama, Tobirama, Hiruzen, and Minato fight Madara to show the past is in the past...it also shows the power of combining Madara with Mokuton, EMS sharingan, and the Rinnegan. Their actions counter Madara's trump card.
6. The Go-Go-Kage Rangers arrive to help fight Obito
7. Hinata, Shikamaru, and Lee manage to co-ordinate to defend Naruto, Sasuke, and Sakura respectively.
8. Hinata uses some form of her Lion fist to take away Obito's ability to tank everything. He still has his speed and his chakra control.
9. Following that, Hinata is KO'd from the fight (that way Sakura takes over for her Heroine roll).
10.Shikamaru developed a winning strategy....one that doesn't suck.
11. Using an initial Ino-Shika-Cho for temporary disruptions....the strategy uses the Gokage Rangers, Lee's 7th gate, Naruto, and Sasuke to leave him completely open for a Sakura punch.
12. Despite his extremely injured condition, Obito survives.
13. Orochimaru is a **** to Uchiha. He arrives to body snatch Obito. Becoming the final villain we deserve, but not the one we've had. Basically one of pure unadulterated evil.
14. By this time the Hokage manage to defeat/seal Madara.
15. Orochimaru releases Edo Tensei causing the Hokage to begin disappearing.
14. Tobirama makes a final sacrifice...using some forbidden Edo Tensei technique to force the other Hokage to make the seals needed to break the contract. He sadly doesn't have time for himself.
15. Orochimaru begins his assault, but Hashirama and Hiruzen press him back.
16. Minato takes this time to transfer his Kurama chakra.
17. Finishing the transfer, he pushes Naruto out of the way and he gets human pathed by Orochimaru.
18. Through subsequent events, Hashirama leaves protecting Sakura. Hiruzen leaves protecting Sasuke.
19. Eventually, the alliance has been mostly defeated except for the Gokage Rangers, and Team 7.
20. With some final blast dealeo...Sakura and Tsunade are out as they use their medical prowess to keel the alliance from vaporization. Tsunade dies, but Sakura lives because Tsunade uses some of her chakra to also protect her student.
21. Naruto and Sasuke are all that's left...by combining their teamwork or through the Hyuga clan before they are all defeated. They get the Rikkudo staff and sword. Naruto: staff....Sasuke: sword.
22. Like the Sage had wanted for his son's...elder and younger work together to best Orochimaru.
24. Naruto manages to free the tailed beasts which aggravates Sasuke.
25. Our alliance losing many members is victorious.
26. We return to peaceful times...Kakashi (managed to live...I guess saved by Minato from the other dimension...say Kakashi carried the FTG kunai st all times) is currently Hokage. We have the closing of the K11 members left alive (Hinata, Lee, Choji, Ino, Shikamaru).
27. As a battle for Hokage and for the destruction of the tailed beasts....Naruto vs Sasuke at the Valley of the End.
28. They basically wreck the area forming a larger valley of the end and waterfall.
29. Sakura who followed them, manages to heal them both or only one of them (your preference)
30. Epilogue. We see who Sakura could save and we find our the final pairings and we find out about how they go on.
Whether Naruto is Hokage or a traveler, Sasuke a wanderer or Hokage. Sakura medical chief or Hokage....