Great prediction. I thoroughly enjoyed reading it.
I like how you brought the Bijuu's chakra back into play. We haven't seen that for a while and I like how you came up with the idea of an ink Rasengan that changes form/density with the surrounding environment.
It's also nice to see Hagoromo enlightening the Hokages of the current situation and restoring them their power to more than they had while they were alive. I hope we see this in the upcoming chapters, especially the regeneration of Minato's arms so that we can finally get a glimpse of that long-named jutsu that was hyped.
Also, I like the idea how the castle represents a gateway for access between the dimensions. It makes sense, considering that Kishi has kinda foreshadowed this in the
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that showed Team 7's journey towards the castle, highlighting its significance of some sort.