There were a lot of plot points that a lot of people correctly guessed for this one, some as far back as 5.0. (Having lots of nerds in the same place to bump ideas off of helps, as does the excess of time.)

1. The PC is the lost Fourteenth Convocation member. (True: their title was Azem the Wanderer, and they were pretty much the same as back then.)
2. The Scions will make it back to the Source safe and sound. (True.)
3. Exarch G'raha will leave the stage in lieu of his Source self, who will receive his memories so we don't have to explain everything. (Entirely true once we learned Exarch G'raha was crystallizing further, raising a death flag for said crystallization to end up killing him.)
4. The Elidibus who sacrificed himself to become Zodiark's heart and the one we're dealing with are one and the same. (Effectively true, though him being a primal bound to the Ancients' wish for salvation was not predicted.)
5. Sapphire Weapon had van Hydrus' combat data loaded into it. (True.)
6. Elidibus' army is made up of Warriors of Light. (Partially true: they're soul fragments summoned from other worlds, but the essential point stands.)
7. A final showdown with Elidibus will take place at the summit of the Crystal Tower. (True, though his form as the classical Amano "Warrior of Light" remained unknown.)
8. Zenos' new accomplice is Asahi in some form. (Yep, it's Fandaniel possessing his corpse.)

It's part of what made the patch kinda boring for me, since just about everything outside of 2P betraying us was predicted (and even that had a bit of a hint, so the possibility was not unknown). Emet-Selch showing up to help in the fight with Elidibus and living up to his true namesake's mythology was very cool though.