Final Fantasy VII Remake and Fate/Grand Order Challenge

The challenge is this: Final Fantasy VII Remake Part 1 ended with the party defeating the Whispers/Arbiters of Fate, meaning they can now defy destiny and move in different ways from the original game, then traveling the world to hunt down Sephiroth. Meanwhile, Chaldea detects the world of Gaia could potentially become a Singularity because of Sephiroth's schemes, so Ritsuka Fujimaru, Mash Kyrielight, and a team of Servants Rayshift to Gaia. They meet Cloud's party and after gaining their trust (likely Aerith and/or Red XIII will sense their pure intentions), will join them in pursuing Sephiroth and foiling his schemes. Sephiroth and Jenova definitely qualify as Beast-level, or at least Avenger-level threats. Cloud's party would likely be amazed by how powerful the Servants are, while many in Chaldea would be fascinated by Materia, especially Da Vinci Lily, and the Servants might be able to absorb them to recharge their Mana. The groups might compare the differences between their summoning methods. Everyone might tease Cloud and Ritsuka for both being chick magnets. There should be good fight scenes and good character interaction. Maybe Tifa gets mentored by Saint Martha, Xuanzang Sanzang, Himiko, and/or Quetzalcoatl. Aerith could connect with Jeanne d'Arc, Anastasia, Medea Lily, and/or Circe. Barret could connect with Napoleon, Moriarty, Lancelot, and/or Nobanaga because they use heavy duty guns, more likely Moriarty or Lancelot because they are fathers who lovingly dote on their daughters (Barret with Marlene, Moriarty with Frankenstein's Monster, Lancelot with Mash). Likely the child Servants like Jack the Ripper and Nursery Rhyme would want to play with Red XIII. Cloud might connect with Siegfried, Sigurd, and Sieg because they use huge swords, and they and Lancelot could train him and give him the sword skills he'd need to beat Sephiroth. Oh, and maybe Sephiroth duels Sasaki Kojiro at one point. After all, Sephiroth's design and absurdly long sword was based on the real Sasaki Kojiro.

By the way, here's how I would rewrite Zack Fair's survival to make sense. During his last stand, Cissnei and her allies were trying to get to him, but were held back by the Whispers. After the Shinra army is defeated, Zack passes the Buster Sword to Cloud and seemingly dies. As Cloud limps off to Midgar, the party in the present defeats the Whispers, leading to the Whispers in the past disappearing like in the game. Cissnei runs to Zack and stabilizes him with Healing Materia, Revival Materia, or a Phoenix Down, leaving him alive but comatose. She and her allies take Zack to a hidden base (or maybe her house) and try to nurse him back to health. The final scene in Part 1 would be Zack waking up and asking for Aerith. This definitely makes more sense than Zack taking Cloud to Midgar, yet nobody noticing him, then him going to Aerith's church but not noticing everything that happened like the Sector 7 plate falling. I think the game's intention is that Zack traveled through time, but this idea makes it less confusing. Anyway, in this fic, after Cissnei fills Zack in on Aerith and the party being fugitives from Shinra, they'll head out to look for them, eventually catching up to them and the members of Chaldea. Zack could bring the Fusion Sword; it would make a nice mythology gag to Advent Children. Maybe Zack and Cissnei will fall in love during their journey, and he'll let Aerith go and give Cloud his blessing. It's still up to the writer to resolve Cloud's memory troubles and the Cloud/Aerith/Tifa love triangle (or love pentagon if you add Yuffie and Jessie to it).