Why do I get the feeling that since we had a few chapters without Sasuke between the mysterious man tease and this chapter we're going to have a few chapters without Naruto now?
I don't think anyone will be surprised it was Kabuto and as much as I wish we had just a few more pure villains it is an interesting dynamic that both men responsible for starting the war are now seeking redemption in some way. Taka's relationship with each other is always quite funny, Suigetsu thinking up names for what Kabuto would be called with Sasuke's eyes got me smiling, seems like a direct nod to Kabutomaru (refresh me was the name Kabutomaru ever spoken in the manga or is it something the fandom came up with?).
Even though Minato being able to use Sage mode did come out of nowhere I do like that this chapter expanded on it and how proficient he is with using it which isn't very well, seems like Jiraiya and Naruto are much better at using it, I wonder if Minato's facial markings being more like Jiraiya's would've sold that he's not very good at using it better but I'd understand if Kishi just simply forgot about the whole perfect Sage mode thing. Either way I could see that in my own little head canon as something Jiraiya had been teaching Minato to pass everything on in the time before Minato died or became Hokage but Minato never had the opportunity to ever master it.
I'm torn between not wanting Gai to die and wanting to see what all 8 gates being opened is like, if I remember properly wasn't it explained like a civilian could gain the power of a Kage using all 8? If so Gai will be amazing using them, and if Gai dies I'd put very good money on Kakashi dying too, they're just such perfect partners. opposites and friends that I can't see one living and the other not.