I think the flying thunder god was the teleportatin jutsu where he teleported to a seal instantly
I believe the difference between the 4th's teleportation jutsu and Madara's was that Kakashi saw Madara teleport without the use of hand signs or scrolls like the 4th used.
Also, if Naruto comes in to save the day via a summoning, I want it to be like Jiraiya's when Orochimaru was attacking the village and he used something like "Ramen shop destroying summoning!" followed by a giant toad landing on it. Maybe Naruto will start posing too like Jiraiya does on top of his summoned frogs.
Finally, Orochimaru's soul is gone. Kabuto has his DNA like Yamato has the 1st Hokage's DNA. Kabuto may take on abilities and personality traits, but he will still be Kabuto.
How funny would it be if Naruto made a frog shaped rasengan? (not serious) lol