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According to minato himself tobi had an answer for all his tricks But kushina had a hol different take on what went down
I theorize she did this to raise da confidence of yung uzi and to make him a lil more proud of his father. This isn't farfetched any loving mother would do so.
My theory
Now what really went down is minato in a last ditch effort tricked tobi & seized his control tobi applauds him then says we can continue our little game another time tells him that crap about the future blah blah... as far as the sealing stuff it all seems true but.... Minato lived WAY TOO LONG after using the death God and being impaled imo...
I could be wrong but minato himself said something different from what kushina showed :shrug: