[NextoftheLegacy]

What about the Yin half of Kurama that Minato sealed with the RDS? Either (1) Orochimaru has it now, or (2) it's been set free. If (2) is the case, then it might return to Naruto, who has the Yang half. OR MAYBE Sasuke will get it and the two will share the 9 tails.

I'm glad we get to hear firsthand accounts from the 1st, 3rd, and especially 2nd. The 2nd is so shrouded in mystery and he's really the beginning of Edo Tensei and space-time jutsus. The 1st will be able to tell us more about Madara and why his own cells are so special, and the 3rd I'll bet has a dirty secret. I don't really know what the 4th can contribute besides his knowledge of the tailed beasts.

Also, what's interesting is that the reader automatically assumes that the Hokages are "good" people even though we barely know anything about them. Now would be a great time for Kishi to twist our expectations.