Board Thread:Naruto Discussions/@comment-3965545-20150906225855/@comment-25977287-20150907223916

I don't agree with minatos stamina being a 4, it has to be a 5. You cannot learn senjutsu, actually scratch that. Ones body cannot even remotely handle nature energy unless the person already possesses enormous chakra inside of them. Without enormous chakra, the nature energy would immediately take over the person, and they'd turn to stone. The fact that Minato is a sage means he has the chakra to be able to handle it.

Confirmed by Fukasaku in the sage training arc. And yes the exact word he used was "Enormous".