I really hope this fight gets patched into the main game. I could see it being in places like where you fight quetzalcoatl, on top of ravatough at night, or leide desert at night. Then again they haven't added in Nidus for chapter 14 Royal Edition or Magic Pot. And I'm still waiting in vain for them to patch in that version of Ifrit that you fight in Comrades. You know, the one fight that was actually interesting and might have made you fight strategically rather than button mash. Also the more I think about the Garuda messenger summon, the more I wish they had added other possible "messengers"/ lower tier summons with a side quest to obtain them like Sylph, Siren, Diabolos, Fenrir, Kirin, Cait Sith, Mauduin, etc. Again that's another reason why FFXV felt half finished, there just isn't that many different options, a lot of it is cut and paste.